Clapper-type electromagnetic relay and electromagnetic relay

Abstract

A clapper-type electromagnetic relay, comprising a magnetic circuit part, a moving reed part, a static reed part. a first load lead-out end (4). and a second load lead-out end (5) electrically connected to the static reed part. The magnetic circuit part comprises a coil former (11). A static contact (32) of the static red part and a moving contact (22) of the moving reed part form a contact set. The first load lead-out end (4). the second load lead-out end (5), and the contact set are located on the same side of the coil former (11), and current carrying paths flowing through the first load lead-out end (4) and the second load lead-out end (5) are located on the same side of the coil former (11).

Description

[0001] This disclosure claims priority to the Chinese patent application filed on January 18, 2023, with the application number 202310079230.0, the entire content of which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This disclosure relates to a relay.BACKGROUND

[0003] A conventional hinge-type electromagnetic relay usually includes a base, a magnetic circuit part, a movable contact part, a static contact part, two load lead-out terminals, and two coil lead-out terminals. The magnetic circuit part includes a bobbin, a coil, an iron core, a yoke, and an armature. The movable contact part includes a movable contact piece and a movable contact disposed on the movable contact piece. The movable contact piece is fixedly connected to the armature to form a movable contact piece-armature assembly. The bobbin, the iron core, the yoke, and the movable contact piece-armature assembly are assembled together in a hinge-type structure. The static contact part includes a static contact piece and a static contact disposed on the static contact piece. The movable contact and the static contact cooperate to form a contact set. The first load lead-out terminal is electrically connected to the movable contact part. The second load lead-out terminal is electrically connected to or integrally formed with the static contact piece. The above hinge-type electromagnetic relay has the following shortcomings: the contact set and the two load lead-out terminals are located on different sides of the bobbin, resulting in a long current-carrying path between the two load lead-out terminals, which not only complicates the structure and increases costs but also makes it difficult to reduce temperature rise. Especially in high-current environments, a longer current-carrying path leads to higher heat generation, resulting in elevated product temperatures, making it difficult for PCB relays to be applied to PCBA (Printed Circuit Board Assembly) with low Tg value (temperature resistance value of PCB copper foil) requirements.SUMMARY

[0004] This disclosure provides a hinge-type electromagnetic relay, which can overcome the problem of high heat generation in conventional hinge-type electromagnetic relays.

[0005] According to one aspect of the present disclosure, a hinge-type electromagnetic relay, including a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal; the magnetic circuit part including a bobbin, a coil, an iron core, a yoke, and an armature; the bobbin including a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion; the movable contact part including a movable contact piece and a movable contact disposed on the movable contact piece; the bobbin, the iron core, the yoke, and the movable contact piece-armature assembly are assembled together in a hinge-type structure; the static contact part including a static contact piece and a static contact disposed on the static contact piece; the movable contact and the static contact cooperate to form a contact set; the first load lead-out terminal is electrically connected to the movable contact part; the second load lead-out terminal is electrically connected to or integrally formed with the static contact piece; wherein the first load lead-out terminal, the second load lead-out terminal, and the contact set are located at a same side of the bobbin, and a current-carrying paths flowing through the first load lead-out terminal and the second load lead-out terminal are located at the same side of the bobbin.

[0006] According to an embodiment of the present disclosure, the first load lead-out terminal and the second load lead-out terminal are parallel to each other along a first horizontal direction.

[0007] According to an embodiment of the present disclosure, the movable contact piece is fixedly connected to the armature to form the movable contact piece-armature assembly; the static contact piece is mounted on the first flange portion; the first load lead-out terminal and the second load lead-out terminal are respectively located at two opposite sides of the first flange portion.

[0008] According to an embodiment of the present disclosure, the first flange portion is inserted with two coil lead-out terminals, and the two coil lead-out terminals are respectively located at another two opposite sides of the first flange portion.

[0009] According to an embodiment of the present disclosure, the movable contact part further includes a flexible connecting wire, and the flexible connecting wire is located at a side of the movable contact piece away from the movable contact; one end of the flexible connecting wire is electrically connected to the movable contact, and another end is electrically connected to the first load lead-out terminal.

[0010] According to an embodiment of the present disclosure, the number of the movable contact is multiple, and the multiple movable contacts are arranged along the first horizontal direction; the number of the static contact and the flexible connecting wire are respectively same as the number of the movable contact; each movable contact is electrically connected to the first load lead-out terminal through one flexible connecting wire.

[0011] According to an embodiment of the present disclosure, among the multiple flexible connecting wires, two outermost flexible connecting wires respectively abut against a limit hook disposed at two opposite ends of the movable contact piece along the first horizontal direction.

[0012] According to an embodiment of the present disclosure, a part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction; each branch piece is provided with at least one movable contact, and a portion of each branch piece where the movable contact is located is widened; adjacent branch pieces are transitioned with a rounded chamfer at roots; a distance between parts of the movable contact pieces where the limit hooks are disposed are smaller than a distance between outer sides of two outermost branch pieces.

[0013] According to an embodiment of the present disclosure, the first load lead-out terminal is provided with a welding piece extending toward the movable contact, and another end of the flexible connecting wire is welded to the welding piece; the first load lead-out terminal is in contact connection with the yoke.

[0014] According to an embodiment of the present disclosure, the hinge-type electromagnetic relay further includes a base and a housing; a bottom end of the housing is provided with an opening, and the housing is connected with the base at the opening to enclose the magnetic circuit part, the movable contact part, and the static contact part; the first load lead-out terminal and the second load lead-out terminal respectively pass through first insertion holes provided on the base; the two coil lead-out terminals respectively pass through second insertion holes provided on the base; the first flange portion is provided with a third insertion hole for the coil lead-out terminal to pass through; an end of the third insertion hole away from the second flange portion is provided with a glue storage groove surrounding the coil lead-out terminal; during potting encapsulation, glue enters from a gap between the coil lead-out terminal and the second insertion hole and fills the glue storage groove.

[0015] According to an embodiment of the present disclosure, inner side surfaces around the glue storage groove are inclined surfaces with roots closer to the coil lead-out terminal; the inner side surface of the second insertion hole corresponding to the glue storage groove is provided with a glue infiltration groove to allow the glue to flow into the glue storage groove along the glue infiltration groove.

[0016] According to an embodiment of the present disclosure, an end of the third insertion hole away from the second flange portion is respectively provided with a stepped surface on two sides facing each other in a second horizontal direction perpendicular to the first horizontal direction; the coil lead-out terminal is respectively provided with a protrusion at a position corresponding to each stepped surface, and the protrusion rests on the stepped surface; the two sides of the third insertion hole facing each other in the second horizontal direction are respectively provided with a guiding groove; a distance between two guiding grooves gradually decreases along an insertion direction of the coil lead-out terminal; the guiding groove is located at an inner side of the stepped surface, and the stepped surface is located at an inner side of the glue storage groove.

[0017] According to an embodiment of the present disclosure, an inner side surface of the housing is provided with guiding ribs extending along a height direction of the housing; positions of the first flange portion and the second flange portion corresponding to the guiding ribs are respectively provided with a guiding groove matching the guiding ribs; the bobbin is equipped with an insulating spacer located between the coil and the yoke; the movable contact piece is L-shaped; one side of the movable contact piece is fixedly connected to the armature and provided with the movable contact; another side of the movable contact piece is fixedly connected to the yoke.

[0018] According to an embodiment of the present disclosure, two ends of the static contact piece along the first horizontal direction are respectively laterally inserted into two insertion slots correspondingly provided on the first flange portion, and the two ends of the static contact piece along the first horizontal direction respectively extend outward with a protrusion along a second horizontal direction perpendicular to the first horizontal direction; a part of the static contact piece not inserted into the first flange portion has a gap with the first flange portion in a height direction; an end surfaces of the first flange portion at the positions where two insertion slots are located are respectively provided with a first boss.

[0019] According to an embodiment of the present disclosure, a part of the first flange portion between the static contact and the armature is provided with a retaining wall, and the retaining wall protrudes beyond the static contact; a part of the first flange portion between the static contact piece and the iron core is provided with a separation groove and / or a partition wall; and / or, an outer surface of the base is provided with multiple second bosses for elevating the electromagnetic relay.

[0020] According to an embodiment of the present disclosure, the first load lead-out terminal and the second load lead-out terminal are parallel to each other along a second horizontal direction.

[0021] According to an embodiment of the present disclosure, the first load lead-out terminal corresponds to the first flange portion, and the second load lead-out terminal corresponds to the second flange portion.

[0022] According to an embodiment of the present disclosure, the second load lead-out terminal is L-shaped and includes a first portion and a second portion, and the first portion is parallel to the first load lead-out terminal.

[0023] According to another aspect of the present disclosure, an electromagnetic relay, including a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal; the movable contact part includes a movable contact piece and a movable contact disposed on the movable contact piece; the magnetic circuit part includes an armature; the magnetic circuit part drives the movable contact piece together with the movable contact through the armature; the electromagnetic relay further includes a flexible conductor; the second load lead-out terminal is electrically connected to or integrally formed with the static contact part; one end of the flexible conductor is electrically connected to the movable contact, and another end is electrically connected to the second load lead-out terminal; the first load lead-out terminal, the flexible conductor, and the second load lead-out terminal are located at a same side of the magnetic circuit part; the first load lead-out terminal, the movable contact piece, and the second load lead-out terminal form a U-shaped structure.

[0024] According to an embodiment of the present disclosure, the magnetic circuit part includes a yoke, an iron core fixed to the yoke, a coil wound around the iron core, and an armature rotatably fitted at a blade edge of the yoke.

[0025] According to an embodiment of the present disclosure, the magnetic circuit part includes a bobbin, a yoke, an iron core, a coil, and an armature; the bobbin includes a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion; the yoke is fixed to the bobbin; the iron core is disposed on the bobbin and fixedly connected to the yoke; the coil is wound around the winding portion; the armature is rotatably fitted at a blade edge of the yoke.

[0026] According to an embodiment of the present disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, and the fixed portion is fixed to the yoke; the armature is plate-shaped, with one end rotatably connected to the blade edge of the yoke and another end extending toward the iron core; the movable contact piece is fixedly connected to the armature.

[0027] According to an embodiment of the present disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, and the fixed portion is fixed to the first load lead-out terminal; the armature is L-shaped and includes a first armature portion and a second armature portion connected to each other; the armature is rotatably connected at a connection position of the first armature portion and the second armature portion to the blade edge of the yoke; the first armature portion extends toward the iron core, and an end of the second armature portion is a cooperating portion that works with the movable contact piece.

[0028] According to an embodiment of the present disclosure, an end of the movable contact piece is provided with two conductive pieces; the movable contact is divided into two groups, respectively fixed on two conductive pieces; the conductive piece has a welding portion.

[0029] According to an embodiment of the present disclosure, two welding portions of the two conductive pieces are respectively located at sides of the movable contact piece away from each other; the number of the flexible conductor is two, respectively disposed at sides of the movable contact piece away from each other; one end of each of the two flexible conductors is electrically connected to corresponding welding portion.

[0030] According to an embodiment of the present disclosure, the flexible conductor is a flexible connecting wire; or, the flexible conductor includes one or multiple stacked conductive reeds, and material of the conductive reed is same as or different from material of the movable contact piece.

[0031] According to an embodiment of the present disclosure, the flexible conductor includes one or multiple stacked conductive reeds; a part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction; each branch piece is provided with at least one movable contact; the conductive reed is forked to form multiple conductive branch pieces, multiple conductive branch pieces are in one-to-one correspondence with the multiple branch pieces.

[0032] According to an embodiment of the present disclosure, the flexible conductor is located inside the U-shaped structure.

[0033] According to an embodiment of the present disclosure, the electromagnetic relay further includes a housing and a base; a bottom end of the housing is provided with an opening; the base is connected to the opening of the housing; the magnetic circuit part, the movable contact part, and the static contact part are all accommodated in a space enclosed by the base and the housing; the first load lead-out terminal and the second load lead-out terminal respectively pass through the base and extend outward to form a current-carrying loop with an external load.

[0034] Compared with the related art, this disclosure has the following beneficial effects:

[0035] The first load lead-out terminal, the second load lead-out terminal, and the contact set are located at the same side of the bobbin, and the current-carrying paths flowing through the first load lead-out terminal and the second load lead-out terminal are located at the same side of the bobbin, making the current-carrying path between the first load lead-out terminal and the second load lead-out terminal the shortest. This not only simplifies the structure of the first load lead-out terminal and the second load lead-out terminal and reduces costs but also helps reduce heat generation in the current-carrying path, suppresses product temperature rise, thereby reducing heat generation in high-current environments, and further enables application to PCBA with a Tg value greater than 125°C.

[0036] Further, the two coil lead-out terminals are respectively located at the other two opposite sides of the first flange portion, ensuring that the first load lead-out terminal, the second load lead-out terminal, and the two coil lead-out terminals are distributed at all four sides of the first flange portion. This guarantees sufficient electrical clearance and creepage distance between the lead-out terminals and improves the voltage resistance performance of the coil lead-out terminals.

[0037] Further, since the movable contact part also includes a flexible connecting wire, the load current capacity can be adjusted by selecting the wire diameter, and the flexibility between contacts can be increased to improve contact gap consistency.

[0038] Further, the movable contact piece is made of stainless steel, which hardly carries current and has better mechanical and fatigue resistance properties compared to copper alloys.

[0039] Further, the movable contact, the static contact, and the flexible connecting wire are each provided in multiple quantities, forming a multi-contact parallel structure in this disclosure. This achieves multi-path current sharing, reduces contact resistance, and while increasing current-carrying capacity, weakens the electro-dynamic repulsion force through current sharing, improving anti-short circuit ability.

[0040] Further, the movable contact piece is designed with a limit hook to restrict the movement range of the flexible connecting wire, preventing it from contacting the adjacent coil lead-out terminal and causing insufficient creepage distance.

[0041] Further, the first load lead-out terminal is provided with a welding piece extending toward the movable contact, and the other end of the flexible connecting wire is welded to the welding piece. This makes the welding point between the flexible connecting wire and the first load lead-out terminal closer to the movable contact than the yoke, further shortening the current path inside the relay and reducing heat generation from the conductor's resistance.

[0042] Further, the arrangement of the glue storage groove not only improves the encapsulation effect after potting but also increases the creepage distance between the coil and the contacts.

[0043] Further, the first load lead-out terminal is in contact with the yoke, thereby forming an integrated structure with the iron core, the armature, and the movable contact piece. This allows heat generated in the current-carrying loop to quickly conduct to metal components such as the yoke and the iron core connected to the first load lead-out terminal, increasing the heat dissipation area and preventing heat concentration.

[0044] Further, the bobbin is equipped with an insulating spacer located between the coil and the yoke, which increases the electrical clearance between the coil and the yoke and enhances the creepage distance.

[0045] The following describes this disclosure in further detail with reference to the accompanying drawings and embodiments; however, the hinge-type electromagnetic relay of this disclosure is not limited to the embodiments.BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG. 1 is an exploded view of the present disclosure. FIG. 2 is a perspective view of the present disclosure without the base and housing. FIG. 3 is a top view of FIG. 2. FIG. 4 is a perspective view showing the movable contact part and the static contact part in a mated state. FIG. 5 is a front view of FIG. 4 with current in one direction. FIG. 6 is a front view of FIG. 4 with current in the other direction. FIG. 7 is a perspective view of the movable contact piece. FIG. 8 is a perspective view of the first load lead-out terminal. FIG. 9 is a perspective view of the second load lead-out terminal and the static contact piece. FIG. 10 is a perspective view of the bobbin assembled with the two coil lead-out terminals. FIG. 11 is an enlarged view of portion A in FIG. 10. FIG. 12 is a bottom view of the base. FIG. 13 is an enlarged view of portion B in FIG. 12. FIG. 14 is a bottom view of the present disclosure. FIG. 15 is a cross-sectional view taken along line A-A in FIG. 14. FIG. 16 is an enlarged view of portion C in FIG. 15. FIG. 17 is a cross-sectional view taken along line B-B in FIG. 14. FIG. 18 is an enlarged view of portion D in FIG. 17. FIG. 19 is a perspective view of the housing. FIG. 20 is a front view of the housing assembled with the magnetic circuit part. FIG. 21 is a cross-sectional view taken along line C-C in FIG. 20. FIG. 22 is a cross-sectional view taken along line D-D in FIG. 20. FIG. 23 is an enlarged view of portion E in FIG. 22. FIG. 24 is a second perspective view of the present disclosure without the base and housing. FIG. 25 is a front view of the bobbin assembled with the coil lead-out terminal. FIG. 26 is a front view of the coil lead-out terminal. FIG. 27 is a cross-sectional view taken along line E-E in FIG. 25. FIG. 28 is an enlarged view of portion F in FIG. 27. FIG. 29 is a third perspective view of the present disclosure without the housing. FIG. 30 is a perspective view of another embodiment of the present disclosure. FIG. 31 is a perspective view of another embodiment from one angle. FIG. 32 is a perspective view of another embodiment from another angle. FIG. 33 is a front view of FIG. 31. FIG. 34 is a perspective view of a further embodiment. FIG. 35 is a front view of FIG. 34 with the flexible connecting wire omitted. FIG. 36 is an external view of the electromagnetic relay according to the first embodiment. FIG. 37 is a cross-sectional view taken along line H-H in FIG. 36. FIG. 38 is a perspective view of the first embodiment with the housing and base removed. FIG. 39 is a schematic diagram showing the current direction in the first embodiment. FIG. 40 is a circuit schematic of the first embodiment. FIG. 41 is a perspective view of the electromagnetic relay according to the second embodiment. FIG. 42 is an exploded perspective view of the second embodiment. FIG. 43 is a perspective view of the flexible conductor used in the second embodiment. FIG. 44 is a perspective view of the flexible conductor used in the third embodiment. FIG. 45 is an exploded perspective view of the third embodiment from one angle with the housing and base omitted. FIG. 46 is an exploded perspective view of the third embodiment from another angle with the housing and base omitted. FIG. 47 is a perspective view of the flexible conductor used in the fourth embodiment. wherein Reference numerals are explained as follows: 1.magnetic circuit part; 11. bobbin; 111.first flange portion; 1111.glue storage groove; 1112.insertion slot; 1113.avoidance groove; 1114.rib; 1115.retaining wall; 1116.first boss; 1117.separation groove; 1118.partition wall; 1119.third insertion hole; 11110.stepped surface; 112. flange portion; 113.winding portion; 114.guiding groove; 12.coil; 13.iron core; 14.yoke; 15.armature; 16.coil lead-out terminal; 2.movable contact part; 21.movable contact piece; 210.fixed portion; 211.limit hook; 212.branch piece; 22.movable contact; 23.flexible connecting wire; 24.conductive reed; 27.conductive piece; 271.welding portion; 3.static contact part; 31.static contact piece; 311.protrusion; 32.static contact; 4.first load lead-out terminal; 41.welding piece; 42.support foot; 43.first shoulder; 5.second load lead-out terminal; 51.second shoulder; 6.base; 61.first insertion hole; 62.second insertion hole; 621.glue infiltration groove; 63.second boss; 7.housing; 71.guiding rib; 8.insulating spacer; 9.arc-extinguishing permanent magnet.DETAILED DESCRIPTION

[0047] The exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments may, however, be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Relative terms such as "upper," "lower," "top," and "bottom" are used in this specification merely for convenience, e.g., to describe the orientation shown in the accompanying drawings. It will be understood that, if the illustrated device is turned over, a component described as being "upper" will become "lower," and vice versa. Similar interpretations apply to other relative terms.

[0048] When a structure is described as being "on" another structure, it may be formed integrally with the other structure, disposed "directly" on the other structure, or disposed "indirectly" on the other structure through an intervening structure.

[0049] The terms "a," "an," "the," and "said" indicate the presence of one or more elements / components / parts. The terms "comprising" and "having" are open-ended and mean that, in addition to the listed elements / components / parts, other elements / components / parts may also be present. The terms "first," "second," and the like are used solely as labels and do not limit the quantity of the objects to which they refer. These terms serve only to distinguish similar objects and do not imply any particular order, sequence, or relative importance unless explicitly stated otherwise. Unless otherwise specified, "plurality" means two or more. The phrase "and / or" describes an associated relationship between associated objects and indicates that three relationships may exist; for example, "A and / or B" may mean A alone, both A and B, or B alone. The symbol " / " generally indicates an "or" relationship between the associated objects.

[0050] With reference to FIGS. 1-29, the hinge-type electromagnetic relay of the present disclosure includes a magnetic circuit part 1, a movable contact part 2, a static contact part 3, a first load lead-out terminal 4, and a second load lead-out terminal 5. The magnetic circuit part 1 includes a bobbin 11, a coil 12, an iron core 13, a yoke 14, and an armature 15. The bobbin 11 includes a first flange portion 111, a second flange portion 112, and a winding portion 113 disposed between the first flange portion 111 and the second flange portion 112. The coil 12 is wound on the winding portion 113. The first flange portion 111 is inserted with two coil lead-out terminals 16, and the two coil lead-out terminals 16 are electrically connected to two ends of the coil 12 respectively. The movable contact part 2 includes a movable contact piece 21 and a movable contact 22 disposed on the movable contact piece 21. The movable contact piece 21 is fixedly connected to the armature 15 to constitute the movable contact piece-armature assembly. The bobbin 11, the iron core 13, the yoke 14, and the movable contact piece-armature assembly are assembled together in the hinge-type structure. Specifically, the movable contact piece 21 and the yoke 14 are each L-shaped, one side of the yoke 14 is fixedly connected to one end of the iron core 13, the other side of the yoke 14 is fitted at the outer side surface of the bobbin 11, one side of the movable contact piece 21 is fixedly connected to the armature 15, and the end portion of the one side of the movable contact piece 21 is provided with movable contacts 22, the other side of the movable contact piece 21 is fixedly connected to the other side of the yoke 14 and presses the armature 15 against the blade edge of the other side of the yoke 14. The fixed connection manner is riveting, but is not limited thereto. Thus, the movable contact piece 21 also provides a restoring reaction force to the armature 15, thereby eliminating the need for additionally arranging the restoring spring piece or the spring and the like. The static contact part 3 includes a static contact piece 31 mounted on the first flange portion 111 and a static contact 32 disposed on the static contact piece 31, the movable contact 22 and the static contact 32 cooperate with each other to constitute the contact set. The first load lead-out terminal 4 is electrically connected to the movable contact part 2, and the second load lead-out terminal 5 is electrically connected to or integrally formed with the static contact piece 31; The first load lead-out terminal 4, the second load lead-out terminal 5, and the contact set are located at the same side of the bobbin 11. The first load lead-out terminal 4 and the second load lead-out terminal 5 are mutually parallel along the first horizontal direction, and the first load lead-out terminal 4 and the second load lead-out terminal 5 are respectively located at the two opposite sides of the first flange portion 111. The two coil lead-out terminals 16 are respectively located at the other two opposite sides of the first flange portion 111, and the two coil lead-out terminals 16 are mutually parallel. The first horizontal direction is the direction where the X-axis is located in FIG. 2, that is, substantially parallel to the arrangement direction of the plurality of the movable contacts 22.

[0051] The movable contact part 2 further includes a flexible connecting wire 23, the flexible connecting wire 23 is located at the side of the movable contact piece 21 away from the movable contact 22, and one end of the flexible connecting wire 23 is electrically connected to the movable contact 22, the other end of the flexible connecting wire 23 is electrically connected to the first load lead-out terminal 4. Thus, the present disclosure is convenient for selecting the wire diameter of the flexible connecting wire 23 to adjust the load current capability, and can also increase the flexibility between the contacts and improve the contact gap consistency. The movable contact piece 21 is stainless steel, basically does not carry current, and has better mechanical and fatigue resistance properties compared with copper alloy. The flexible connecting wire 23 is soft copper wire. The static contact piece 31, the first load lead-out terminal 4, and the second load lead-out terminal 5 are made of copper or copper alloy material and have good electrical conductivity.

[0052] In the present embodiment, the number of the movable contact 22 is plural, the plurality of the movable contact 22 are arranged along the first horizontal direction. The number of the static contact 32 is plural. The number of the flexible connecting wire 23 is plural. The plurality of the static contacts 32 and the plurality of the flexible connecting wires 23 respectively correspond one-to-one to the plurality of the movable contact 22. Each movable contact 22 is electrically connected to the first load lead-out terminal 4 through a flexible connecting wire 23.

[0053] In the present embodiment, the movable contact piece 21 is respectively provided with a limit hook 211 at two opposite ends along the first horizontal direction, as shown in FIG. 7, among the plurality of the flexible connecting wires 23, the two flexible connecting wires 23 located outermost respectively abut against the limit hook 211 provided at the two opposite sides of the movable contact piece 21, as shown in FIGS. 3-6. Thus, the movement range of the two outermost flexible connecting wires 23 can be limited to prevent the two outermost flexible connecting wires 23 from overlapping to the adjacent coil lead-out terminal 16 and causing the creepage distance insufficient.

[0054] In the present embodiment, as shown in FIG. 7, the portion of the movable contact piece 21 provided with the movable contact is forked to form a plurality of the branch pieces 212 away from each other along the first horizontal direction through bifurcation, each branch piece 212 is provided with a movable contact 22, and the portion of each branch piece 212 provided with the movable contact 22 is widened, the distance between the portions of the movable contact piece 21 provided with the limit hook 211 is smaller than the distance between the opposite outer sides of the two outermost branch pieces. Thus, the space can be provided for the design of the limit hook 211, preventing the limit hook 211 and the two sides of the bobbin from being too close, and further preventing the flexible connecting wires 23 from overlapping to the second load lead-out terminal 5 and causing short circuit or poor withstand voltage. In the present embodiment, the portion where the limit hook 211 is located avoids branch pieces 212, the distance between the opposite outer sides of the two outermost branch pieces gradually decreases from the tail portion toward the root portion direction of the branch piece, so that the separation groove formed between the adjacent branch pieces (except the middle separation groove) is inclined, and the adjacent branch pieces 212 transitions at the root portions with an arc chamfer, so as to facilitate the design of the parameter detection groove and prevent the parameter detection groove from being blocked by the flexible connecting wire and causing inability to perform the parameter test. In addition, the adjacent branch pieces 212 are transitioned by the arc chamfer at the root portions, which is beneficial for balancing the contact pressure among the contact sets. The parameter refers to the mechanical parameters, for example the reaction force, the over-travel, the contact gap, and the like.

[0055] The movable contact piece 21 adopts a forked design, which is beneficial to increase the flexibility of the movable contact piece 21. The number of the movable contact 22 is greater than or equal to three, specifically, in the present embodiment, the number of the movable contacts 22 is four, but is not limited thereto. The number of the static contacts 32 and the number of the flexible connecting wires are required to be the same. Thus, the present disclosure forms a multi-group contact parallel structure, realizing multi-path current shunting, reducing the contact resistance, the structure increases the current carrying while weakening the electrodynamic repulsion force through shunting, and improves the anti-short-circuit current capability.

[0056] In the present embodiment, as shown in FIG. 8, the first load lead-out terminal 4 is provided with a welding piece 41 extending toward the direction of the movable contact 22, the other end of the flexible connecting wire 23 is welded to the welding piece 41. The number of the welding piece 41 is two, but is not limited thereto, the two welding pieces 41 are arranged side by side, the four flexible connecting wires 23 are divided into two groups, the other ends of the two flexible connecting wire 23 in each group are welded to the same welding piece 41.

[0057] In the present embodiment, as shown in FIG. 9, the second load lead-out terminal 5 is integrally formed with the static contact piece 31, the static contact piece 31 is specifically divided into two parallel parts, each part is provided with two static contacts 32.

[0058] In the present embodiment, two ends of the static contact piece 31 along the first horizontal direction are respectively laterally inserted into two insertion slots 1112 correspondingly provided on the first flange portion 111, and the two ends of the static contact piece 31 along the first horizontal direction respectively extend outward along the second horizontal direction perpendicular to the first horizontal direction with the protrusion 311, as shown in FIG. 9, the protrusion 311 can provide a force-bearing point for the static contact piece 31 to be inserted into the bobbin 11, preventing the static contact piece 31 from tilting after insertion. A gap exists in the height direction between the non-inserted portion of the static contact piece 31 and the first flange portion 111. Thus, the avoidance space can be provided to prevent scratching the bobbin during assembly, and can enable the static contact 32 not to directly contact the bobbin, thereby reducing the risk of burning and melting the bobbin when large heat is generated around the contacts, and simultaneously the gap is conducive to heat dissipation and prevents heat concentration. Specifically, as shown in FIG. 10, the portion of the first flange portion 111 between the two insertion slot 1112 is provided with an avoidance groove 1113, to create the gap. The first flange portion 111 is provided with a first boss 1116 at the end surface of the portions where the two insertion slot 1112 are located, and the portion of the static contact piece 31 inserted and fitted with the first flange portion is flattened. Thus, the space can be provided for the coil, the thickness of the plastic wall of the fitted portions is increased, and the bonding strength is enhanced. The second horizontal direction is the direction where the Y-axis in FIG. 2 is located.

[0059] In this embodiment, this disclosure further includes a base 6 and a housing 7. The housing 7 has an opening at the bottom end, and the housing 7 at the opening is connected with the base 6, enclosing the magnetic circuit part 1, the movable contact part 2, and the static contact part 3 therein. Specifically, the bottom end of the housing 7 is snap-connected with the base 6. The first load lead-out terminal 4 and the second load lead-out terminal 5 respectively pass through first insertion holes 61 provided on the base 6, and the two coil lead-out terminals 16 respectively pass through second insertion holes 62 provided on the base 6. The first flange portion 111 is provided with third insertion holes 1119 for the coil lead-out terminals 16 to pass through. At the end of the third insertion hole 1119 away from the second flange portion 112, there is a glue storage groove 1111 surrounding the coil lead-out terminal 16, as shown in FIG. 10 and FIG. 11. During potting encapsulation, glue enters from the gap between the coil lead-out terminal and the second insertion hole 62 and fills the glue storage groove 1111, as shown in FIG. 14 to FIG. 16. The arrangement of the glue storage groove 1111 not only improves the encapsulation effect after potting but also increases the creepage distance between the coil 12 and the contacts.

[0060] In this embodiment, the inner side surfaces around the glue storage groove 1111 are inclined surfaces with roots closer to the coil lead-out terminal 16, making the volume of the glue storage groove 1111 smaller, reducing glue usage, and ensuring effective encapsulation around the coil lead-out terminal 16.

[0061] In this embodiment, the inner side surface of the second insertion hole 62 corresponding to the glue storage groove 1111 is provided with a glue infiltration groove 621 to allow glue to flow into the glue storage groove 1111 along the glue infiltration groove 621. Specifically, as shown in FIG. 12 to FIG. 16, the two inner side surfaces of the second insertion hole 62 in the width direction are respectively provided with multiple glue infiltration grooves 621. The glue infiltration groove 621 can improve the glue infiltration speed and effect.

[0062] In this embodiment, the first load lead-out terminal 4 is in contact connection with the yoke 14. Specifically, two support feet 42 extend from the first load lead-out terminal 4 toward the bobbin 11 as shown in FIG. 8. The two support feet 42 are respectively connected to the other side of the yoke 14 by riveting or welding. This integrates the first load lead-out terminal 4 with the yoke 14, the iron core 13, the armature 15, and the movable contact piece 21, allowing heat generated in the current-carrying loop to quickly conduct to metal components such as the yoke 14 and the iron core 13 connected to the first load lead-out terminal 4, thereby increasing the heat dissipation area and preventing heat concentration.

[0063] In this embodiment, the base 6 is equipped with two arc-extinguishing permanent magnets 9 arranged along the first horizontal direction. The magnetic pole distribution directions of the two arc-extinguishing permanent magnets 9 are the same, and respectively located in the first horizontal direction. The movable contact 22 and the static contact 32 are located between the two arc-extinguishing permanent magnets 9. The magnetic field generated by the arc-extinguishing permanent magnet 9 is consistent with the direction of the self-magnetic field generated by the load loop where the first load lead-out terminal 4 is located. The part of the first flange portion 111 facing the two arc-extinguishing permanent magnets 9 is respectively provided with a rib 1114, which presses against the arc-extinguishing permanent magnet 9, as shown in FIG. 17 and FIG. 18. This prevents the arc-extinguishing permanent magnet 9 from shaking and forms multi-point support between the base 6 and the bobbin 11, improving stability. The first load lead-out terminal 4 is provided with two first shoulders 43 (as shown in FIG. 8), and the second load lead-out terminal 5 is provided with two second shoulders 51 (as shown in FIG. 9). The first shoulders 43 and the second shoulders 51 respectively press against the base 6 to position the base 6. The bottom surface of the base 6 is provided with multiple second bosses 63 to elevate the electromagnetic relay, as shown in FIG. 1, FIG. 14, and FIG. 29. When this disclosure needs to be soldered to a PCB, the second bosses 63 can elevate the relay to prevent direct contact between the PCB board and the base 6, which would cause heat concentration. Therefore, the second bosses 63 helps provide heat dissipation space. In addition, during potting encapsulation around the base 6, the design of the second bosses 63 can prevent excessive glue from affecting PCB soldering. The second bosses 63 can also increase the creepage distance between the coil lead-out terminal 16 and the first load lead-out terminal 4, the second load lead-out terminal 5. The number of the second bosses 63 is specifically four, arranged in two rows and two columns.

[0064] In this embodiment, the inner side surface of the housing 7 is provided with a guiding rib 71 extending along its height direction (as shown in FIG. 19). The positions of the first flange portion 111 and the second flange portion 112 corresponding to the guiding ribs 71 are respectively provided with a guiding groove 114 matching the guiding ribs 71, as shown in FIG. 10, FIG. 20, and FIG. 21. The height direction is the direction of the Z-axis direction in FIG. 2. Specifically, the two inner side surfaces of the housing 7 in the first horizontal direction are each provided with a guiding rib 71. The two guiding ribs 71 are respectively offset from the middle position of their inner side surfaces and located on the same side of the middle position. The design of the guiding ribs 71 and the guiding grooves 114 provides assembly guidance and prevents the housing 7 from being installed in reverse.

[0065] In this embodiment, as shown in FIG. 22 to FIG. 24, the part of the first flange portion 111 between the static contact 32 and the armature 15 is provided with a retaining wall 1115, which protrudes beyond the static contact 32 and can block contacts flying debris. The part of the first flange portion 111 between the static contact piece 31 and the iron core 13 is provided with a separation groove 1117 and / or a partition wall 1118, which increases the difficulty of the flying debris reaching the iron core 13 and also increases the creepage distance between the static contact 32 and the iron core 13. The iron core 13 adopts a laminated design but is not limited to this.

[0066] In this embodiment, as shown in FIG. 25 to FIG. 28, the end of the third insertion hole 1119 away from the second flange portion 112 is respectively provided with a stepped surface 11110 on the two sides facing each other in the second horizontal direction perpendicular to the first horizontal direction. The coil lead-out terminal 16 is respectively provided with a protrusion 161 at the positions corresponding to each stepped surface 11110, and the protrusion 161 rests on the stepped surface 11110. This provides a pressing force point for assembly tools and can also serve as a positioning reference. The two sides of the third insertion hole 1119 facing each other in the second horizontal direction are respectively provided with a guiding groove 11111, which is located at the inner side of the stepped surface 11110 (i.e., the side of the stepped surface 11110 closer to the second flange portion 112). The distance between the two guiding grooves 11111 gradually decreases along the insertion direction of the coil lead-out terminal 16. The guiding groove 11111 helps guide the slender coil lead-out terminal 16 during insertion and collects plastic debris generated during insertion, avoiding product failure due to poor conduction. The stepped surface 11110 is located at the inner side of the glue storage groove 1111.

[0067] In this embodiment, as shown in FIG. 29, the bobbin 11 is equipped with an insulating spacer 8 located between the coil 12 and the other side of the yoke 14, which can increase the electrical clearance between the coil 12 and the yoke 14 and increase the creepage distance. The insulating spacer 8 is roughly ]-shaped, with its two ends respectively snapped onto the first flange portion 111 and the second flange portion 112 of the bobbin 11.

[0068] The hinge-type electromagnetic relay of this disclosure has the first load lead-out terminal 4, the second load lead-out terminal 5, and the contact set located at the same side of the bobbin 11. The first load lead-out terminal 4 and the second load lead-out terminal 5 are parallel to each other, and the first load lead-out terminal 4 and the second load lead-out terminal 5 are respectively located at two opposite sides of the first flange portion 111, making the current path between the first load lead-out terminal 4 and the second load lead-out terminal 5 the shortest: current sequentially passes through the first load lead-out terminal 4, the flexible connecting wire 23, and the contact set to flow to the second load lead-out terminal 5, or current sequentially passes through the second load lead-out terminal 5, the contact set, and the flexible connecting wire 23 to flow to the first load lead-out terminal 4. This not only simplifies the structure of the first load lead-out terminal 4 and the second load lead-out terminal 5, saving costs, but also helps reduce heat generation in high-current environments, thereby lowering product temperature rise. Notably, the movable contact piece 21 is made of stainless steel, hardly carries current, and generates low heat. The movable contact part 2 mainly relies on the flexible connecting wire 23 to carry current. Therefore, the movable contact part 2 of this disclosure achieves an elasticity and current carrying separation design. As the working current increases, the movable contact piece 21 will not generate excessive heat. Thus, not affecting the magnetic conductivity of the armature 15 or the elasticity of the movable contact piece 21 itself. The flexible connecting wire 23 is soft copper wire, and the first load lead-out terminal 4 and the second load lead-out terminal 5 are made of copper or copper alloy, providing good conductivity. By selecting the wire diameter of the flexible connecting wire 23, the load capacity can be adjusted, enabling this disclosure to significantly increase current-carrying capacity while maintaining the same volume, achieving miniaturization and high current-carrying effects. The first load lead-out terminal 4, the second load lead-out terminal 5, and the two coil lead-out terminals 16 are distributed on the four edges of the first flange portion 111, ensuring sufficient electrical clearance and creepage distance between the lead-out terminals and improving the voltage resistance performance of the coil lead-out terminal.

[0069] The hinge-type electromagnetic relay of this disclosure adopts an inverted structure. During current-carrying, the magnetic field generated by the current in the second load lead-out terminal 5 and the static contact piece 31 is perpendicular to the arc direction, exerting a force F1 on the arc (as shown in FIG. 5 and FIG. 6). The magnetic field of the arc-extinguishing permanent magnet and the self-magnetic field generated by the current in the load loop can be used for magnetic blowout arc extinguishing. The larger the current, the more obvious the effect, effectively improving electrical life capability. The magnetic field direction of the arc-extinguishing permanent magnet is consistent with the self-magnetic field direction generated by the load. During operation, in the magnetic field generated by the second load lead-out terminal 5 and the static contact piece 31, the flexible connecting wire 23 will be subjected to a downward Ampere force F2 due to the current (as shown in FIG. 5 and FIG. 6), offsetting the electro-dynamic repulsion force, making the movable contact 22 press tightly against the static contact 32, reducing the impact of electro-dynamic repulsion, and increasing the ability of the relay to withstand short-circuit current shocks. FIG. 5 and FIG. 6 show two states with reversed current directions.

[0070] In other embodiments, as shown in FIG. 30, the second load lead-out terminal 5 is L-shaped, including a first portion 51 and a second portion 52 that form an angle between them. The first portion 51 is parallel to the first load lead-out terminal 4. By adjusting the shape of the second load lead-out terminal 5, it can adapt to installation requirements of different applications while maintaining compact internal structure layout and high space utilization. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 1 and FIG. 2, and will not be repeated here.

[0071] In other embodiments, as shown in FIG. 31 to FIG. 33, the first load lead-out terminal 4 and the second load lead-out terminal 5 are parallel to each other along the second horizontal direction. Further, the first load lead-out terminal 4 corresponds to the first flange portion 111 of the bobbin 11, and the second load lead-out terminal 5 corresponds to the second flange portion 112 of the bobbin 11. The armature 15 is L-shaped and includes a first portion 150 and a second portion 151 that form an angle between them. The connection position between the first portion 150 and the second portion 151 fits with the blade edge of the yoke 14. The first portion 150 is located at the outer side of the first flange portion 111, and the end of the second portion 151 movably cooperates with the movable contact piece 21. When the first portion 150 of the armature 15 is attracted by the iron core 13, the second portion 151 moves toward the movable contact piece 21 and pushes the movable contact piece 21. The end of the movable contact piece 21 away from the movable contact 22 is bent and extended to form a fixed portion 210, which is fixed to the first load lead-out terminal 4. The flexible connecting wire 23 is located on the movable contact piece 21, with one end electrically connected to the movable contact 22 and the other end electrically connected to the first load lead-out terminal 4. In certain applications, this embodiment can simplify the structure to meet layout requirements. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 1 and FIG. 2 and will not be repeated here.

[0072] In other embodiments, as shown in FIG. 34 and FIG. 35, the movable contact piece 21 does not have the fixed portion 210 but is fixedly connected to the armature 15 by riveting or other fixing methods. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 31 and will not be repeated here.

[0073] This disclosure also provides an electromagnetic relay with low heat generation.

[0074] According to one aspect of this disclosure, an electromagnetic relay includes a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal. The movable contact part includes a movable contact piece and a movable contact disposed on the movable contact piece. The magnetic circuit part includes an armature. The magnetic circuit part drives the movable contact piece together with the movable contact through the armature. wherein the electromagnetic relay further includes a flexible conductor. The second load lead-out terminal is electrically connected to or integrally formed with the static contact part. One end of the flexible conductor is electrically connected to the movable contact, and another end is electrically connected to the second load lead-out terminal. The first load lead-out terminal, the flexible conductor, and the second load lead-out terminal are located at a same side of the magnetic circuit part. The first load lead-out terminal, the movable contact piece, and the second load lead-out terminal form a U-shaped structure.

[0075] According to one embodiment of this disclosure, the magnetic circuit part includes a yoke, an iron core fixed to the yoke, a coil wound around the iron core, and an armature rotatably fitted at a blade edge of the yoke.

[0076] According to one embodiment of this disclosure, the magnetic circuit part includes a bobbin, a yoke, an iron core, a coil, and an armature. The bobbin includes a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion. The yoke is fixed to the bobbin. The iron core is disposed on the bobbin and fixedly connected to the yoke. The coil is wound around the winding portion. The armature is rotatably fitted at the blade edge of the yoke.

[0077] According to one embodiment of this disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, the fixed portion is fixed to the yoke. The armature is plate-shaped, with one end rotatably connected to the blade edge of the yoke and another end extending toward the iron core. The movable contact piece is fixedly connected to the armature.

[0078] According to one embodiment of this disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, the fixed portion is fixed to the first load lead-out terminal. The armature is L-shaped and includes a first armature portion and a second armature portion connected to each other. The armature is rotatably connected to the blade edge of the yoke at a connection position of the first armature portion and the second armature portion. The first armature portion extends toward the iron core, and the end of the second armature portion is a cooperating portion that works with the movable contact piece.

[0079] According to one embodiment of this disclosure, the end of the movable contact piece is provided with two conductive pieces. The movable contact is divided into two groups, respectively fixed on two conductive pieces. Each of the conductive piece has a welding portion.

[0080] According to one embodiment of this disclosure, the two welding portions of the two conductive pieces are respectively located at two sides of the movable contact piece away from each other. a number of the flexible conductor is two, respectively disposed at sides of the movable contact piece away from each other. One end of each of the two flexible conductors is electrically connected to corresponding welding portion.

[0081] According to one embodiment of this disclosure, the flexible conductor is a flexible connecting wire; or, the flexible conductor includes one or multiple stacked conductive reeds. The material of the conductive reed is the same as or different from the material of the movable contact piece.

[0082] According to one embodiment of this disclosure, the flexible conductor includes one or multiple stacked conductive reeds. The part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction. Each branch piece is provided with at least one movable contact. The conductive reed is forked to form multiple conductive branch pieces, which correspond one-to-one with the multiple branch pieces.

[0083] According to one embodiment of this disclosure, the flexible conductor is located inside the U-shaped structure.

[0084] According to one embodiment of this disclosure, the electromagnetic relay further includes a housing and a base. A bottom end of the housing is provided with an opening. The base is connected to the housing at the opening. The magnetic circuit part, the movable contact part, and the static contact part are all accommodated in a space enclosed by the base and the housing. The first load lead-out terminal and the second load lead-out terminal respectively pass through the base and extend outward to form a current-carrying loop with an external load.

[0085] Compared with the prior art, the electromagnetic relay of this disclosure has the following beneficial effects: The first load lead-out terminal and the second load lead-out terminal are electrically connected through the flexible conductor, and the first load lead-out terminal, the flexible conductor, and the second load lead-out terminal are located at the same side of the magnetic circuit part, making the current-carrying path between the first load lead-out terminal and the second load lead-out terminal short. This not only simplifies the structure of the first load lead-out terminal and the second load lead-out terminal and reduces costs but also helps reduce heat generation in the current-carrying path, suppresses product temperature rise, and is conducive to reducing heat generation in high-current environments, thereby enabling application to PCBA with a Tg value greater than 125°C. At the same time, the first load lead-out terminal, the movable contact piece, and the second load lead-out terminal form a U-shaped structure, which is conducive to compact structural layout and reduced volume.

[0086] Hereinafter, specific implementations of the electromagnetic relay of this disclosure will be described with reference to the accompanying drawings.

[0087] As shown in FIG. 36, FIG. 37, and FIG. 38, the first embodiment of the electromagnetic relay of this disclosure includes a housing 7, a base 6, a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal 4, a second load lead-out terminal 5, and a flexible conductor.

[0088] As shown in FIG. 37, the bottom end of the housing 7 is provided with an opening. The base 6 is connected to the housing 7 at the opening. The magnetic circuit part, the movable contact part, and the static contact part are all accommodated in the space enclosed by the base 6 and the housing 7.

[0089] Referring to FIG. 37 and FIG. 38, the magnetic circuit part includes a coil 12, an iron core 13, a yoke 14, and an armature 15.

[0090] In this first embodiment, the yoke 14 is L-shaped and includes a horizontal first yoke portion 141 and a vertical second yoke portion 142. The iron core 13 is vertically disposed, with its upper end fixed to the first yoke portion 141. The coil 12 is wound around the iron core 13. The armature 15 is plate-shaped, with one end rotatably fitted at the blade edge of the yoke 14 and the other end extending toward the iron core 13 and located below the iron core 13.

[0091] The structure of the magnetic circuit part in this disclosure can vary and is not limited to the specific description above. For example, in some other embodiments, the structure of the magnetic circuit part may be the same as that of the hinge-type electromagnetic relay shown in FIG. 1, i.e., including a bobbin 11, a yoke 14, an iron core 13, a coil 12, and an armature 15. The bobbin 11 includes a first flange portion 111, a second flange portion 112, and a winding portion 113 disposed between the first flange portion 111 and the second flange portion 112. The iron core 13 is disposed on the bobbin 11. The yoke 14 is fixedly connected to one end of the iron core 13. The coil 12 is wound around the winding portion. The armature 15 is rotatably fitted at the blade edge of the yoke 14. An insulating spacer 8 is provided on the side of the yoke 14 facing the coil 12.

[0092] The static contact part includes a static contact piece 31 and a static contact 32 fixed on the static contact piece 31. In this first embodiment, the second load lead-out terminal 5 is integrally formed with the static contact piece 31. The static contact piece 31 is located inside the housing 7, and the second load lead-out terminal 5 passes through the base 6 and extends outward. In some other embodiments, the second load lead-out terminal 5 and the static contact piece 31 may also be two independent components electrically connected by welding or other fixing methods.

[0093] The movable contact part includes a movable contact piece 21, a movable contact 22, and a fixed portion 210. The movable contact 22 is fixed to one end of the movable contact piece 21. The fixed portion 210 is bent and extended from the end of the movable contact piece 21 away from the movable contact 22, and the end of the fixed portion 210 is fixed to the yoke 14. The armature 15 is fixedly connected to the movable contact piece 21. The static contact piece 31 is located above the movable contact 22, and the static contact 32 is disposed on the lower surface of the static contact piece 31. The movable contact 22 is disposed on the upper surface of the movable contact piece 21. The static contact 32 and the movable contact 22 cooperate to form a contact set.

[0094] As shown in FIG. 38, in this first embodiment, the flexible conductor is the flexible connecting wire 23, and the number of the flexible connecting wire 23 may be the same as the number of the movable contact. One end of the flexible connecting wire 23 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. In this first embodiment, the armature 15 is located at the side of the movable contact piece 21 where the movable contact 22 is disposed, and the flexible connecting wire 23 is located at the side of the movable contact piece 21 away from the movable contact 22, i.e., the flexible connecting wire 23 and the armature 15 are respectively disposed at the two sides of the movable contact piece 21.

[0095] As shown in FIG. 37 and FIG. 38, in this first embodiment, the first load lead-out terminal 4, the movable contact piece 21, and the second load lead-out terminal 5 form a U-shaped structure, and the flexible connecting wire 23 is located inside the U-shaped structure, making the structure of this disclosure compact.

[0096] Referring to FIG. 37, FIG. 39, and FIG. 40, in this first embodiment, the rotation of the armature 15 can drive the movable contact piece 21 together with the movable contact 22. Specifically, when current flows through the coil 12, the end of the armature 15 below the iron core 13 is attracted by the iron core 13 and moves upward. The movable contact piece 21 is fixedly connected to the armature 15, so the movable contact piece 21 moves upward with the armature 15, thereby driving the movable contact 22 at the end of the movable contact piece 21 to move upward and electrically contact the static contact 32, conducting the current-carrying loop. Conversely, when no current flows through the coil 12, the movable contact piece 21 moves downward, driving the movable contact 22 to separate from the static contact 32, thereby breaking the current-carrying loop.

[0097] In this first embodiment, as shown in FIG. 40, the first load lead-out terminal 4 and the second load lead-out terminal 5 are electrically connected to an external load. The current sequentially flows through the second load lead-out terminal 5, the static contact 32, the movable contact 22, the flexible connecting wire 23, to the first load lead-out terminal 4, the external load, and then back to the second load lead-out terminal 5, forming a current-carrying loop. Since the first load lead-out terminal 4, the flexible connecting wire 23, and the second load lead-out terminal 5 are located at the same side of the magnetic circuit part, the current-carrying path is short, which helps reduce heat generation in the current-carrying path, suppresses product temperature rise, and is conducive to reducing heat generation in high-current environments.

[0098] As shown in FIG. 41 to FIG. 43, in the second embodiment of the electromagnetic relay of this disclosure, the flexible conductor is one or multiple stacked conductive reeds 24. The conductive reed 24 is located at the side of the movable contact piece 21 away from the movable contact 22. One end of the conductive reed 24 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. The material of the conductive reed 24 may be the same as or different from that of the movable contact piece 21. The multiple stacked conductive reeds 24 improve flexibility and simplify the structure.

[0099] Further, the part of the movable contact piece 21 where the movable contact 22 is disposed is forked to form multiple branch pieces 212 apart from each other along the first horizontal direction. Each branch piece 212 is provided with at least one movable contact 22. The conductive reed 24 is forked to form multiple conductive branch pieces 241, which correspond one-to-one with the multiple branch pieces 212. The forked design of the conductive reed 24 can reduce mutual interference between the multiple conductive branch pieces 241, prevent interference, improve flexibility, and make the contact state between the movable contact 22 and the static contact 32 better.

[0100] The current path between the first load lead-out terminal 4 and the second load lead-out terminal 5 is as follows: the current sequentially flows through the first load lead-out terminal 4, the conductive reed 24, the movable contact 22, the static contact 32, to the second load lead-out terminal 5, the external load, and then back to the first load lead-out terminal 4, forming a current loop. Alternatively, the current sequentially flows through the second load lead-out terminal 5, the static contact 32, the movable contact 22, the conductive reed 24, to the first load lead-out terminal 4, the external load, and then back to the second load lead-out terminal 5, forming a current loop. This not only simplifies the structure of the first load lead-out terminal 4 and the second load lead-out terminal 5, saving costs, but also helps reduce heat generation in high-current environments, thereby lowering product temperature rise.

[0101] The other structures and working principles of the second embodiment of the electromagnetic relay are basically the same as those of the first embodiment of the electromagnetic relay shown in FIG. 36 and will not be repeated here.

[0102] In addition, in the second embodiment of the electromagnetic relay, the conductive reed 24 used as the flexible conductor can also replace the flexible connecting wire 23 in the hinge-type electromagnetic relay shown in FIG. 2. As shown in FIG. 44, in the third embodiment of the electromagnetic relay of this disclosure, the flexible conductor is one or multiple stacked conductive reeds 24. The shape and structure of the conductive reed 24 are the same as those of the movable contact piece 21, so the multiple conductive reeds 24 and the movable contact piece 21 can be stacked. One end of the conductive reed 24 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. The conductive reed 24 and the movable contact piece 21 are both fixed to the armature 15. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 41 and will not be repeated here. The other structures and working principles of the third embodiment of the electromagnetic relay are basically the same as those of the second embodiment of the electromagnetic relay shown in FIG. 41 and will not be repeated here.

[0103] In addition, in the third embodiment of the electromagnetic relay, the conductive reed 24 used as the flexible conductor can also replace the flexible connecting wire 23 in the hinge-type electromagnetic relay shown in FIG. 2.

[0104] Referring to FIG. 45 and FIG. 46, in the third embodiment of the electromagnetic relay of this disclosure, the movable contact piece 21 is fixed to the first load lead-out terminal 4 through the fixed portion 210. The movable contact 22 is disposed on the lower surface of the movable contact piece 21. The static contact piece 31 is located below the movable contact 22, and the static contact 32 is disposed on the upper surface of the static contact piece 31. The static contact 32 and the movable contact 22 cooperate to form a contact set.

[0105] The armature 15 is L-shaped and includes a first armature portion 151 and a second armature portion 152 connected to each other and form an obtuse angle. The armature 15 is rotatably connected to the blade edge of the yoke 14 at the connection position of the first armature portion 151 and the second armature portion 152. The first armature portion 151 extends toward the iron core 13, and the end of the second armature portion 152 is a cooperating portion that works with the movable contact piece 21. When the armature 15 rotates around the blade edge of the yoke 14, the end of the second armature portion 152 can press downward on the movable contact piece 21, making the movable contact 22 electrically contact the static contact 32. When the armature 15 rotates in the reverse direction, the end of the second armature portion 152 stops pressing the movable contact piece 21, making the movable contact 22 separate from the static contact 32 and breaking the current-carrying loop.

[0106] The other structures and working principles of the third embodiment of the electromagnetic relay are basically the same as those of the first embodiment of the electromagnetic relay shown in FIG. 36 and will not be repeated here.

[0107] Referring to FIG. 47, in the fourth embodiment of the electromagnetic relay of this disclosure, the end of the movable contact piece 21 is provided with two conductive pieces 27. The movable contact 22 is divided into two groups, with each group including at least two movable contacts 22. The two groups of movable contacts 22 are respectively fixed on the two conductive pieces 27. As shown in FIG. 47, each conductive piece 27 is provided with two movable contacts 22.

[0108] The conductive piece 27 has a welding portion 271. In this fourth embodiment, the two conductive pieces 27 respectively extend to the opposite sides of the movable contact piece 21. The part of the conductive piece 27 extending out of the movable contact piece 21 is the welding portion 271, i.e., the two welding portions 271 of the two conductive pieces 27 are respectively located at the opposite sides of the movable contact piece 21. The welding portion 271 provides a welding position for the flexible connecting wire 23 to facilitate the electrical connection between the flexible connecting wire 23 and the movable contact. The number of the flexible connecting wire 23 is two, respectively disposed at the opposite sides of the movable contact piece 21. One end of the flexible connecting wire 23 is electrically connected to the welding portion 271, and the other end is electrically connected to the first load lead-out terminal 4.

[0109] The conductive piece 27 with the welding portion 271 is not limited to the above fourth embodiment and is also applicable to other embodiments. For example, in the embodiment shown in FIG. 38, the end of the movable contact piece 21 is provided with two conductive pieces 27. The movable contact 22 is divided into two groups, with each group including two movable contacts 22. The two groups of movable contacts 22 are respectively disposed on the two conductive pieces 27, i.e., each conductive piece 27 is provided with two movable contacts 22. The welding portion 271 of the conductive piece 27 may be located between the two movable contacts 22 or at the end close to the other conductive piece 27. In this way, only two flexible connecting wires 23 are needed. One end of each of the two flexible connecting wires 23 is electrically connected to one welding portion 271, and the other end is electrically connected to the second load lead-out terminal 5. Since the number of the flexible connecting wire 23 is less, the occupied space is small, and the arrangement is convenient, the limit hook 211 may not be needed.

[0110] The other structures and working principles of the fourth embodiment of the electromagnetic relay are basically the same as those of the third embodiment of the electromagnetic relay shown in FIG. 45 and will not be repeated here.

[0111] The above are only preferred implementations of the disclosed embodiments and are not intended to limit the disclosed embodiments. For those skilled in the art, the disclosed embodiments may have various modifications and changes. Any modifications, equivalent replacements, or improvements made within the spirit and principles of the disclosed claims shall be included within the protection scope of the disclosed claims.

Examples

first embodiment

[0087]As shown in FIG. 36, FIG. 37, and FIG. 38, the electromagnetic relay of this disclosure includes a housing 7, a base 6, a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal 4, a second load lead-out terminal 5, and a flexible conductor.

[0088]As shown in FIG. 37, the bottom end of the housing 7 is provided with an opening. The base 6 is connected to the housing 7 at the opening. The magnetic circuit part, the movable contact part, and the static contact part are all accommodated in the space enclosed by the base 6 and the housing 7.

[0089]Referring to FIG. 37 and FIG. 38, the magnetic circuit part includes a coil 12, an iron core 13, a yoke 14, and an armature 15.

[0090]In this first embodiment, the yoke 14 is L-shaped and includes a horizontal first yoke portion 141 and a vertical second yoke portion 142. The iron core 13 is vertically disposed, with its upper end fixed to the first yoke portion 141. The coil 12 is wound around t...

second embodiment

[0098]As shown in FIG. 41 to FIG. 43, in the electromagnetic relay of this disclosure, the flexible conductor is one or multiple stacked conductive reeds 24. The conductive reed 24 is located at the side of the movable contact piece 21 away from the movable contact 22. One end of the conductive reed 24 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. The material of the conductive reed 24 may be the same as or different from that of the movable contact piece 21. The multiple stacked conductive reeds 24 improve flexibility and simplify the structure.

[0099]Further, the part of the movable contact piece 21 where the movable contact 22 is disposed is forked to form multiple branch pieces 212 apart from each other along the first horizontal direction. Each branch piece 212 is provided with at least one movable contact 22. The conductive reed 24 is forked to form multiple conductive branch pieces 241, w...

third embodiment

[0103]In addition, in the electromagnetic relay, the conductive reed 24 used as the flexible conductor can also replace the flexible connecting wire 23 in the hinge-type electromagnetic relay shown in FIG. 2.

[0104]Referring to FIG. 45 and FIG. 46, in the third embodiment of the electromagnetic relay of this disclosure, the movable contact piece 21 is fixed to the first load lead-out terminal 4 through the fixed portion 210. The movable contact 22 is disposed on the lower surface of the movable contact piece 21. The static contact piece 31 is located below the movable contact 22, and the static contact 32 is disposed on the upper surface of the static contact piece 31. The static contact 32 and the movable contact 22 cooperate to form a contact set.

[0105]The armature 15 is L-shaped and includes a first armature portion 151 and a second armature portion 152 connected to each other and form an obtuse angle. The armature 15 is rotatably connected to the blade edge of the yoke 14 at the ...

[0001] This disclosure claims priority to the Chinese patent application filed on January 18, 2023, with the application number 202310079230.0, the entire content of which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This disclosure relates to a relay.BACKGROUND

[0003] A conventional hinge-type electromagnetic relay usually includes a base, a magnetic circuit part, a movable contact part, a static contact part, two load lead-out terminals, and two coil lead-out terminals. The magnetic circuit part includes a bobbin, a coil, an iron core, a yoke, and an armature. The movable contact part includes a movable contact piece and a movable contact disposed on the movable contact piece. The movable contact piece is fixedly connected to the armature to form a movable contact piece-armature assembly. The bobbin, the iron core, the yoke, and the movable contact piece-armature assembly are assembled together in a hinge-type structure. The static contact part includes a static contact piece and a static contact disposed on the static contact piece. The movable contact and the static contact cooperate to form a contact set. The first load lead-out terminal is electrically connected to the movable contact part. The second load lead-out terminal is electrically connected to or integrally formed with the static contact piece. The above hinge-type electromagnetic relay has the following shortcomings: the contact set and the two load lead-out terminals are located on different sides of the bobbin, resulting in a long current-carrying path between the two load lead-out terminals, which not only complicates the structure and increases costs but also makes it difficult to reduce temperature rise. Especially in high-current environments, a longer current-carrying path leads to higher heat generation, resulting in elevated product temperatures, making it difficult for PCB relays to be applied to PCBA (Printed Circuit Board Assembly) with low Tg value (temperature resistance value of PCB copper foil) requirements.SUMMARY

[0004] This disclosure provides a hinge-type electromagnetic relay, which can overcome the problem of high heat generation in conventional hinge-type electromagnetic relays.

[0005] According to one aspect of the present disclosure, a hinge-type electromagnetic relay, including a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal; the magnetic circuit part including a bobbin, a coil, an iron core, a yoke, and an armature; the bobbin including a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion; the movable contact part including a movable contact piece and a movable contact disposed on the movable contact piece; the bobbin, the iron core, the yoke, and the movable contact piece-armature assembly are assembled together in a hinge-type structure; the static contact part including a static contact piece and a static contact disposed on the static contact piece; the movable contact and the static contact cooperate to form a contact set; the first load lead-out terminal is electrically connected to the movable contact part; the second load lead-out terminal is electrically connected to or integrally formed with the static contact piece; wherein the first load lead-out terminal, the second load lead-out terminal, and the contact set are located at a same side of the bobbin, and a current-carrying paths flowing through the first load lead-out terminal and the second load lead-out terminal are located at the same side of the bobbin.

[0006] According to an embodiment of the present disclosure, the first load lead-out terminal and the second load lead-out terminal are parallel to each other along a first horizontal direction.

[0007] According to an embodiment of the present disclosure, the movable contact piece is fixedly connected to the armature to form the movable contact piece-armature assembly; the static contact piece is mounted on the first flange portion; the first load lead-out terminal and the second load lead-out terminal are respectively located at two opposite sides of the first flange portion.

[0008] According to an embodiment of the present disclosure, the first flange portion is inserted with two coil lead-out terminals, and the two coil lead-out terminals are respectively located at another two opposite sides of the first flange portion.

[0009] According to an embodiment of the present disclosure, the movable contact part further includes a flexible connecting wire, and the flexible connecting wire is located at a side of the movable contact piece away from the movable contact; one end of the flexible connecting wire is electrically connected to the movable contact, and another end is electrically connected to the first load lead-out terminal.

[0010] According to an embodiment of the present disclosure, the number of the movable contact is multiple, and the multiple movable contacts are arranged along the first horizontal direction; the number of the static contact and the flexible connecting wire are respectively same as the number of the movable contact; each movable contact is electrically connected to the first load lead-out terminal through one flexible connecting wire.

[0011] According to an embodiment of the present disclosure, among the multiple flexible connecting wires, two outermost flexible connecting wires respectively abut against a limit hook disposed at two opposite ends of the movable contact piece along the first horizontal direction.

[0012] According to an embodiment of the present disclosure, a part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction; each branch piece is provided with at least one movable contact, and a portion of each branch piece where the movable contact is located is widened; adjacent branch pieces are transitioned with a rounded chamfer at roots; a distance between parts of the movable contact pieces where the limit hooks are disposed are smaller than a distance between outer sides of two outermost branch pieces.

[0013] According to an embodiment of the present disclosure, the first load lead-out terminal is provided with a welding piece extending toward the movable contact, and another end of the flexible connecting wire is welded to the welding piece; the first load lead-out terminal is in contact connection with the yoke.

[0014] According to an embodiment of the present disclosure, the hinge-type electromagnetic relay further includes a base and a housing; a bottom end of the housing is provided with an opening, and the housing is connected with the base at the opening to enclose the magnetic circuit part, the movable contact part, and the static contact part; the first load lead-out terminal and the second load lead-out terminal respectively pass through first insertion holes provided on the base; the two coil lead-out terminals respectively pass through second insertion holes provided on the base; the first flange portion is provided with a third insertion hole for the coil lead-out terminal to pass through; an end of the third insertion hole away from the second flange portion is provided with a glue storage groove surrounding the coil lead-out terminal; during potting encapsulation, glue enters from a gap between the coil lead-out terminal and the second insertion hole and fills the glue storage groove.

[0015] According to an embodiment of the present disclosure, inner side surfaces around the glue storage groove are inclined surfaces with roots closer to the coil lead-out terminal; the inner side surface of the second insertion hole corresponding to the glue storage groove is provided with a glue infiltration groove to allow the glue to flow into the glue storage groove along the glue infiltration groove.

[0016] According to an embodiment of the present disclosure, an end of the third insertion hole away from the second flange portion is respectively provided with a stepped surface on two sides facing each other in a second horizontal direction perpendicular to the first horizontal direction; the coil lead-out terminal is respectively provided with a protrusion at a position corresponding to each stepped surface, and the protrusion rests on the stepped surface; the two sides of the third insertion hole facing each other in the second horizontal direction are respectively provided with a guiding groove; a distance between two guiding grooves gradually decreases along an insertion direction of the coil lead-out terminal; the guiding groove is located at an inner side of the stepped surface, and the stepped surface is located at an inner side of the glue storage groove.

[0017] According to an embodiment of the present disclosure, an inner side surface of the housing is provided with guiding ribs extending along a height direction of the housing; positions of the first flange portion and the second flange portion corresponding to the guiding ribs are respectively provided with a guiding groove matching the guiding ribs; the bobbin is equipped with an insulating spacer located between the coil and the yoke; the movable contact piece is L-shaped; one side of the movable contact piece is fixedly connected to the armature and provided with the movable contact; another side of the movable contact piece is fixedly connected to the yoke.

[0018] According to an embodiment of the present disclosure, two ends of the static contact piece along the first horizontal direction are respectively laterally inserted into two insertion slots correspondingly provided on the first flange portion, and the two ends of the static contact piece along the first horizontal direction respectively extend outward with a protrusion along a second horizontal direction perpendicular to the first horizontal direction; a part of the static contact piece not inserted into the first flange portion has a gap with the first flange portion in a height direction; an end surfaces of the first flange portion at the positions where two insertion slots are located are respectively provided with a first boss.

[0019] According to an embodiment of the present disclosure, a part of the first flange portion between the static contact and the armature is provided with a retaining wall, and the retaining wall protrudes beyond the static contact; a part of the first flange portion between the static contact piece and the iron core is provided with a separation groove and / or a partition wall; and / or, an outer surface of the base is provided with multiple second bosses for elevating the electromagnetic relay.

[0020] According to an embodiment of the present disclosure, the first load lead-out terminal and the second load lead-out terminal are parallel to each other along a second horizontal direction.

[0021] According to an embodiment of the present disclosure, the first load lead-out terminal corresponds to the first flange portion, and the second load lead-out terminal corresponds to the second flange portion.

[0022] According to an embodiment of the present disclosure, the second load lead-out terminal is L-shaped and includes a first portion and a second portion, and the first portion is parallel to the first load lead-out terminal.

[0023] According to another aspect of the present disclosure, an electromagnetic relay, including a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal; the movable contact part includes a movable contact piece and a movable contact disposed on the movable contact piece; the magnetic circuit part includes an armature; the magnetic circuit part drives the movable contact piece together with the movable contact through the armature; the electromagnetic relay further includes a flexible conductor; the second load lead-out terminal is electrically connected to or integrally formed with the static contact part; one end of the flexible conductor is electrically connected to the movable contact, and another end is electrically connected to the second load lead-out terminal; the first load lead-out terminal, the flexible conductor, and the second load lead-out terminal are located at a same side of the magnetic circuit part; the first load lead-out terminal, the movable contact piece, and the second load lead-out terminal form a U-shaped structure.

[0024] According to an embodiment of the present disclosure, the magnetic circuit part includes a yoke, an iron core fixed to the yoke, a coil wound around the iron core, and an armature rotatably fitted at a blade edge of the yoke.

[0025] According to an embodiment of the present disclosure, the magnetic circuit part includes a bobbin, a yoke, an iron core, a coil, and an armature; the bobbin includes a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion; the yoke is fixed to the bobbin; the iron core is disposed on the bobbin and fixedly connected to the yoke; the coil is wound around the winding portion; the armature is rotatably fitted at a blade edge of the yoke.

[0026] According to an embodiment of the present disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, and the fixed portion is fixed to the yoke; the armature is plate-shaped, with one end rotatably connected to the blade edge of the yoke and another end extending toward the iron core; the movable contact piece is fixedly connected to the armature.

[0027] According to an embodiment of the present disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, and the fixed portion is fixed to the first load lead-out terminal; the armature is L-shaped and includes a first armature portion and a second armature portion connected to each other; the armature is rotatably connected at a connection position of the first armature portion and the second armature portion to the blade edge of the yoke; the first armature portion extends toward the iron core, and an end of the second armature portion is a cooperating portion that works with the movable contact piece.

[0028] According to an embodiment of the present disclosure, an end of the movable contact piece is provided with two conductive pieces; the movable contact is divided into two groups, respectively fixed on two conductive pieces; the conductive piece has a welding portion.

[0029] According to an embodiment of the present disclosure, two welding portions of the two conductive pieces are respectively located at sides of the movable contact piece away from each other; the number of the flexible conductor is two, respectively disposed at sides of the movable contact piece away from each other; one end of each of the two flexible conductors is electrically connected to corresponding welding portion.

[0030] According to an embodiment of the present disclosure, the flexible conductor is a flexible connecting wire; or, the flexible conductor includes one or multiple stacked conductive reeds, and material of the conductive reed is same as or different from material of the movable contact piece.

[0031] According to an embodiment of the present disclosure, the flexible conductor includes one or multiple stacked conductive reeds; a part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction; each branch piece is provided with at least one movable contact; the conductive reed is forked to form multiple conductive branch pieces, multiple conductive branch pieces are in one-to-one correspondence with the multiple branch pieces.

[0032] According to an embodiment of the present disclosure, the flexible conductor is located inside the U-shaped structure.

[0033] According to an embodiment of the present disclosure, the electromagnetic relay further includes a housing and a base; a bottom end of the housing is provided with an opening; the base is connected to the opening of the housing; the magnetic circuit part, the movable contact part, and the static contact part are all accommodated in a space enclosed by the base and the housing; the first load lead-out terminal and the second load lead-out terminal respectively pass through the base and extend outward to form a current-carrying loop with an external load.

[0034] Compared with the related art, this disclosure has the following beneficial effects:

[0035] The first load lead-out terminal, the second load lead-out terminal, and the contact set are located at the same side of the bobbin, and the current-carrying paths flowing through the first load lead-out terminal and the second load lead-out terminal are located at the same side of the bobbin, making the current-carrying path between the first load lead-out terminal and the second load lead-out terminal the shortest. This not only simplifies the structure of the first load lead-out terminal and the second load lead-out terminal and reduces costs but also helps reduce heat generation in the current-carrying path, suppresses product temperature rise, thereby reducing heat generation in high-current environments, and further enables application to PCBA with a Tg value greater than 125°C.

[0036] Further, the two coil lead-out terminals are respectively located at the other two opposite sides of the first flange portion, ensuring that the first load lead-out terminal, the second load lead-out terminal, and the two coil lead-out terminals are distributed at all four sides of the first flange portion. This guarantees sufficient electrical clearance and creepage distance between the lead-out terminals and improves the voltage resistance performance of the coil lead-out terminals.

[0037] Further, since the movable contact part also includes a flexible connecting wire, the load current capacity can be adjusted by selecting the wire diameter, and the flexibility between contacts can be increased to improve contact gap consistency.

[0038] Further, the movable contact piece is made of stainless steel, which hardly carries current and has better mechanical and fatigue resistance properties compared to copper alloys.

[0039] Further, the movable contact, the static contact, and the flexible connecting wire are each provided in multiple quantities, forming a multi-contact parallel structure in this disclosure. This achieves multi-path current sharing, reduces contact resistance, and while increasing current-carrying capacity, weakens the electro-dynamic repulsion force through current sharing, improving anti-short circuit ability.

[0040] Further, the movable contact piece is designed with a limit hook to restrict the movement range of the flexible connecting wire, preventing it from contacting the adjacent coil lead-out terminal and causing insufficient creepage distance.

[0041] Further, the first load lead-out terminal is provided with a welding piece extending toward the movable contact, and the other end of the flexible connecting wire is welded to the welding piece. This makes the welding point between the flexible connecting wire and the first load lead-out terminal closer to the movable contact than the yoke, further shortening the current path inside the relay and reducing heat generation from the conductor's resistance.

[0042] Further, the arrangement of the glue storage groove not only improves the encapsulation effect after potting but also increases the creepage distance between the coil and the contacts.

[0043] Further, the first load lead-out terminal is in contact with the yoke, thereby forming an integrated structure with the iron core, the armature, and the movable contact piece. This allows heat generated in the current-carrying loop to quickly conduct to metal components such as the yoke and the iron core connected to the first load lead-out terminal, increasing the heat dissipation area and preventing heat concentration.

[0044] Further, the bobbin is equipped with an insulating spacer located between the coil and the yoke, which increases the electrical clearance between the coil and the yoke and enhances the creepage distance.

[0045] The following describes this disclosure in further detail with reference to the accompanying drawings and embodiments; however, the hinge-type electromagnetic relay of this disclosure is not limited to the embodiments.BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG. 1 is an exploded view of the present disclosure. FIG. 2 is a perspective view of the present disclosure without the base and housing. FIG. 3 is a top view of FIG. 2. FIG. 4 is a perspective view showing the movable contact part and the static contact part in a mated state. FIG. 5 is a front view of FIG. 4 with current in one direction. FIG. 6 is a front view of FIG. 4 with current in the other direction. FIG. 7 is a perspective view of the movable contact piece. FIG. 8 is a perspective view of the first load lead-out terminal. FIG. 9 is a perspective view of the second load lead-out terminal and the static contact piece. FIG. 10 is a perspective view of the bobbin assembled with the two coil lead-out terminals. FIG. 11 is an enlarged view of portion A in FIG. 10. FIG. 12 is a bottom view of the base. FIG. 13 is an enlarged view of portion B in FIG. 12. FIG. 14 is a bottom view of the present disclosure. FIG. 15 is a cross-sectional view taken along line A-A in FIG. 14. FIG. 16 is an enlarged view of portion C in FIG. 15. FIG. 17 is a cross-sectional view taken along line B-B in FIG. 14. FIG. 18 is an enlarged view of portion D in FIG. 17. FIG. 19 is a perspective view of the housing. FIG. 20 is a front view of the housing assembled with the magnetic circuit part. FIG. 21 is a cross-sectional view taken along line C-C in FIG. 20. FIG. 22 is a cross-sectional view taken along line D-D in FIG. 20. FIG. 23 is an enlarged view of portion E in FIG. 22. FIG. 24 is a second perspective view of the present disclosure without the base and housing. FIG. 25 is a front view of the bobbin assembled with the coil lead-out terminal. FIG. 26 is a front view of the coil lead-out terminal. FIG. 27 is a cross-sectional view taken along line E-E in FIG. 25. FIG. 28 is an enlarged view of portion F in FIG. 27. FIG. 29 is a third perspective view of the present disclosure without the housing. FIG. 30 is a perspective view of another embodiment of the present disclosure. FIG. 31 is a perspective view of another embodiment from one angle. FIG. 32 is a perspective view of another embodiment from another angle. FIG. 33 is a front view of FIG. 31. FIG. 34 is a perspective view of a further embodiment. FIG. 35 is a front view of FIG. 34 with the flexible connecting wire omitted. FIG. 36 is an external view of the electromagnetic relay according to the first embodiment. FIG. 37 is a cross-sectional view taken along line H-H in FIG. 36. FIG. 38 is a perspective view of the first embodiment with the housing and base removed. FIG. 39 is a schematic diagram showing the current direction in the first embodiment. FIG. 40 is a circuit schematic of the first embodiment. FIG. 41 is a perspective view of the electromagnetic relay according to the second embodiment. FIG. 42 is an exploded perspective view of the second embodiment. FIG. 43 is a perspective view of the flexible conductor used in the second embodiment. FIG. 44 is a perspective view of the flexible conductor used in the third embodiment. FIG. 45 is an exploded perspective view of the third embodiment from one angle with the housing and base omitted. FIG. 46 is an exploded perspective view of the third embodiment from another angle with the housing and base omitted. FIG. 47 is a perspective view of the flexible conductor used in the fourth embodiment. wherein Reference numerals are explained as follows: 1.magnetic circuit part; 11. bobbin; 111.first flange portion; 1111.glue storage groove; 1112.insertion slot; 1113.avoidance groove; 1114.rib; 1115.retaining wall; 1116.first boss; 1117.separation groove; 1118.partition wall; 1119.third insertion hole; 11110.stepped surface; 112. flange portion; 113.winding portion; 114.guiding groove; 12.coil; 13.iron core; 14.yoke; 15.armature; 16.coil lead-out terminal; 2.movable contact part; 21.movable contact piece; 210.fixed portion; 211.limit hook; 212.branch piece; 22.movable contact; 23.flexible connecting wire; 24.conductive reed; 27.conductive piece; 271.welding portion; 3.static contact part; 31.static contact piece; 311.protrusion; 32.static contact; 4.first load lead-out terminal; 41.welding piece; 42.support foot; 43.first shoulder; 5.second load lead-out terminal; 51.second shoulder; 6.base; 61.first insertion hole; 62.second insertion hole; 621.glue infiltration groove; 63.second boss; 7.housing; 71.guiding rib; 8.insulating spacer; 9.arc-extinguishing permanent magnet.DETAILED DESCRIPTION

[0047] The exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments may, however, be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Relative terms such as "upper," "lower," "top," and "bottom" are used in this specification merely for convenience, e.g., to describe the orientation shown in the accompanying drawings. It will be understood that, if the illustrated device is turned over, a component described as being "upper" will become "lower," and vice versa. Similar interpretations apply to other relative terms.

[0048] When a structure is described as being "on" another structure, it may be formed integrally with the other structure, disposed "directly" on the other structure, or disposed "indirectly" on the other structure through an intervening structure.

[0049] The terms "a," "an," "the," and "said" indicate the presence of one or more elements / components / parts. The terms "comprising" and "having" are open-ended and mean that, in addition to the listed elements / components / parts, other elements / components / parts may also be present. The terms "first," "second," and the like are used solely as labels and do not limit the quantity of the objects to which they refer. These terms serve only to distinguish similar objects and do not imply any particular order, sequence, or relative importance unless explicitly stated otherwise. Unless otherwise specified, "plurality" means two or more. The phrase "and / or" describes an associated relationship between associated objects and indicates that three relationships may exist; for example, "A and / or B" may mean A alone, both A and B, or B alone. The symbol " / " generally indicates an "or" relationship between the associated objects.

[0050] With reference to FIGS. 1-29, the hinge-type electromagnetic relay of the present disclosure includes a magnetic circuit part 1, a movable contact part 2, a static contact part 3, a first load lead-out terminal 4, and a second load lead-out terminal 5. The magnetic circuit part 1 includes a bobbin 11, a coil 12, an iron core 13, a yoke 14, and an armature 15. The bobbin 11 includes a first flange portion 111, a second flange portion 112, and a winding portion 113 disposed between the first flange portion 111 and the second flange portion 112. The coil 12 is wound on the winding portion 113. The first flange portion 111 is inserted with two coil lead-out terminals 16, and the two coil lead-out terminals 16 are electrically connected to two ends of the coil 12 respectively. The movable contact part 2 includes a movable contact piece 21 and a movable contact 22 disposed on the movable contact piece 21. The movable contact piece 21 is fixedly connected to the armature 15 to constitute the movable contact piece-armature assembly. The bobbin 11, the iron core 13, the yoke 14, and the movable contact piece-armature assembly are assembled together in the hinge-type structure. Specifically, the movable contact piece 21 and the yoke 14 are each L-shaped, one side of the yoke 14 is fixedly connected to one end of the iron core 13, the other side of the yoke 14 is fitted at the outer side surface of the bobbin 11, one side of the movable contact piece 21 is fixedly connected to the armature 15, and the end portion of the one side of the movable contact piece 21 is provided with movable contacts 22, the other side of the movable contact piece 21 is fixedly connected to the other side of the yoke 14 and presses the armature 15 against the blade edge of the other side of the yoke 14. The fixed connection manner is riveting, but is not limited thereto. Thus, the movable contact piece 21 also provides a restoring reaction force to the armature 15, thereby eliminating the need for additionally arranging the restoring spring piece or the spring and the like. The static contact part 3 includes a static contact piece 31 mounted on the first flange portion 111 and a static contact 32 disposed on the static contact piece 31, the movable contact 22 and the static contact 32 cooperate with each other to constitute the contact set. The first load lead-out terminal 4 is electrically connected to the movable contact part 2, and the second load lead-out terminal 5 is electrically connected to or integrally formed with the static contact piece 31; The first load lead-out terminal 4, the second load lead-out terminal 5, and the contact set are located at the same side of the bobbin 11. The first load lead-out terminal 4 and the second load lead-out terminal 5 are mutually parallel along the first horizontal direction, and the first load lead-out terminal 4 and the second load lead-out terminal 5 are respectively located at the two opposite sides of the first flange portion 111. The two coil lead-out terminals 16 are respectively located at the other two opposite sides of the first flange portion 111, and the two coil lead-out terminals 16 are mutually parallel. The first horizontal direction is the direction where the X-axis is located in FIG. 2, that is, substantially parallel to the arrangement direction of the plurality of the movable contacts 22.

[0051] The movable contact part 2 further includes a flexible connecting wire 23, the flexible connecting wire 23 is located at the side of the movable contact piece 21 away from the movable contact 22, and one end of the flexible connecting wire 23 is electrically connected to the movable contact 22, the other end of the flexible connecting wire 23 is electrically connected to the first load lead-out terminal 4. Thus, the present disclosure is convenient for selecting the wire diameter of the flexible connecting wire 23 to adjust the load current capability, and can also increase the flexibility between the contacts and improve the contact gap consistency. The movable contact piece 21 is stainless steel, basically does not carry current, and has better mechanical and fatigue resistance properties compared with copper alloy. The flexible connecting wire 23 is soft copper wire. The static contact piece 31, the first load lead-out terminal 4, and the second load lead-out terminal 5 are made of copper or copper alloy material and have good electrical conductivity.

[0052] In the present embodiment, the number of the movable contact 22 is plural, the plurality of the movable contact 22 are arranged along the first horizontal direction. The number of the static contact 32 is plural. The number of the flexible connecting wire 23 is plural. The plurality of the static contacts 32 and the plurality of the flexible connecting wires 23 respectively correspond one-to-one to the plurality of the movable contact 22. Each movable contact 22 is electrically connected to the first load lead-out terminal 4 through a flexible connecting wire 23.

[0053] In the present embodiment, the movable contact piece 21 is respectively provided with a limit hook 211 at two opposite ends along the first horizontal direction, as shown in FIG. 7, among the plurality of the flexible connecting wires 23, the two flexible connecting wires 23 located outermost respectively abut against the limit hook 211 provided at the two opposite sides of the movable contact piece 21, as shown in FIGS. 3-6. Thus, the movement range of the two outermost flexible connecting wires 23 can be limited to prevent the two outermost flexible connecting wires 23 from overlapping to the adjacent coil lead-out terminal 16 and causing the creepage distance insufficient.

[0054] In the present embodiment, as shown in FIG. 7, the portion of the movable contact piece 21 provided with the movable contact is forked to form a plurality of the branch pieces 212 away from each other along the first horizontal direction through bifurcation, each branch piece 212 is provided with a movable contact 22, and the portion of each branch piece 212 provided with the movable contact 22 is widened, the distance between the portions of the movable contact piece 21 provided with the limit hook 211 is smaller than the distance between the opposite outer sides of the two outermost branch pieces. Thus, the space can be provided for the design of the limit hook 211, preventing the limit hook 211 and the two sides of the bobbin from being too close, and further preventing the flexible connecting wires 23 from overlapping to the second load lead-out terminal 5 and causing short circuit or poor withstand voltage. In the present embodiment, the portion where the limit hook 211 is located avoids branch pieces 212, the distance between the opposite outer sides of the two outermost branch pieces gradually decreases from the tail portion toward the root portion direction of the branch piece, so that the separation groove formed between the adjacent branch pieces (except the middle separation groove) is inclined, and the adjacent branch pieces 212 transitions at the root portions with an arc chamfer, so as to facilitate the design of the parameter detection groove and prevent the parameter detection groove from being blocked by the flexible connecting wire and causing inability to perform the parameter test. In addition, the adjacent branch pieces 212 are transitioned by the arc chamfer at the root portions, which is beneficial for balancing the contact pressure among the contact sets. The parameter refers to the mechanical parameters, for example the reaction force, the over-travel, the contact gap, and the like.

[0055] The movable contact piece 21 adopts a forked design, which is beneficial to increase the flexibility of the movable contact piece 21. The number of the movable contact 22 is greater than or equal to three, specifically, in the present embodiment, the number of the movable contacts 22 is four, but is not limited thereto. The number of the static contacts 32 and the number of the flexible connecting wires are required to be the same. Thus, the present disclosure forms a multi-group contact parallel structure, realizing multi-path current shunting, reducing the contact resistance, the structure increases the current carrying while weakening the electrodynamic repulsion force through shunting, and improves the anti-short-circuit current capability.

[0056] In the present embodiment, as shown in FIG. 8, the first load lead-out terminal 4 is provided with a welding piece 41 extending toward the direction of the movable contact 22, the other end of the flexible connecting wire 23 is welded to the welding piece 41. The number of the welding piece 41 is two, but is not limited thereto, the two welding pieces 41 are arranged side by side, the four flexible connecting wires 23 are divided into two groups, the other ends of the two flexible connecting wire 23 in each group are welded to the same welding piece 41.

[0057] In the present embodiment, as shown in FIG. 9, the second load lead-out terminal 5 is integrally formed with the static contact piece 31, the static contact piece 31 is specifically divided into two parallel parts, each part is provided with two static contacts 32.

[0058] In the present embodiment, two ends of the static contact piece 31 along the first horizontal direction are respectively laterally inserted into two insertion slots 1112 correspondingly provided on the first flange portion 111, and the two ends of the static contact piece 31 along the first horizontal direction respectively extend outward along the second horizontal direction perpendicular to the first horizontal direction with the protrusion 311, as shown in FIG. 9, the protrusion 311 can provide a force-bearing point for the static contact piece 31 to be inserted into the bobbin 11, preventing the static contact piece 31 from tilting after insertion. A gap exists in the height direction between the non-inserted portion of the static contact piece 31 and the first flange portion 111. Thus, the avoidance space can be provided to prevent scratching the bobbin during assembly, and can enable the static contact 32 not to directly contact the bobbin, thereby reducing the risk of burning and melting the bobbin when large heat is generated around the contacts, and simultaneously the gap is conducive to heat dissipation and prevents heat concentration. Specifically, as shown in FIG. 10, the portion of the first flange portion 111 between the two insertion slot 1112 is provided with an avoidance groove 1113, to create the gap. The first flange portion 111 is provided with a first boss 1116 at the end surface of the portions where the two insertion slot 1112 are located, and the portion of the static contact piece 31 inserted and fitted with the first flange portion is flattened. Thus, the space can be provided for the coil, the thickness of the plastic wall of the fitted portions is increased, and the bonding strength is enhanced. The second horizontal direction is the direction where the Y-axis in FIG. 2 is located.

[0059] In this embodiment, this disclosure further includes a base 6 and a housing 7. The housing 7 has an opening at the bottom end, and the housing 7 at the opening is connected with the base 6, enclosing the magnetic circuit part 1, the movable contact part 2, and the static contact part 3 therein. Specifically, the bottom end of the housing 7 is snap-connected with the base 6. The first load lead-out terminal 4 and the second load lead-out terminal 5 respectively pass through first insertion holes 61 provided on the base 6, and the two coil lead-out terminals 16 respectively pass through second insertion holes 62 provided on the base 6. The first flange portion 111 is provided with third insertion holes 1119 for the coil lead-out terminals 16 to pass through. At the end of the third insertion hole 1119 away from the second flange portion 112, there is a glue storage groove 1111 surrounding the coil lead-out terminal 16, as shown in FIG. 10 and FIG. 11. During potting encapsulation, glue enters from the gap between the coil lead-out terminal and the second insertion hole 62 and fills the glue storage groove 1111, as shown in FIG. 14 to FIG. 16. The arrangement of the glue storage groove 1111 not only improves the encapsulation effect after potting but also increases the creepage distance between the coil 12 and the contacts.

[0060] In this embodiment, the inner side surfaces around the glue storage groove 1111 are inclined surfaces with roots closer to the coil lead-out terminal 16, making the volume of the glue storage groove 1111 smaller, reducing glue usage, and ensuring effective encapsulation around the coil lead-out terminal 16.

[0061] In this embodiment, the inner side surface of the second insertion hole 62 corresponding to the glue storage groove 1111 is provided with a glue infiltration groove 621 to allow glue to flow into the glue storage groove 1111 along the glue infiltration groove 621. Specifically, as shown in FIG. 12 to FIG. 16, the two inner side surfaces of the second insertion hole 62 in the width direction are respectively provided with multiple glue infiltration grooves 621. The glue infiltration groove 621 can improve the glue infiltration speed and effect.

[0062] In this embodiment, the first load lead-out terminal 4 is in contact connection with the yoke 14. Specifically, two support feet 42 extend from the first load lead-out terminal 4 toward the bobbin 11 as shown in FIG. 8. The two support feet 42 are respectively connected to the other side of the yoke 14 by riveting or welding. This integrates the first load lead-out terminal 4 with the yoke 14, the iron core 13, the armature 15, and the movable contact piece 21, allowing heat generated in the current-carrying loop to quickly conduct to metal components such as the yoke 14 and the iron core 13 connected to the first load lead-out terminal 4, thereby increasing the heat dissipation area and preventing heat concentration.

[0063] In this embodiment, the base 6 is equipped with two arc-extinguishing permanent magnets 9 arranged along the first horizontal direction. The magnetic pole distribution directions of the two arc-extinguishing permanent magnets 9 are the same, and respectively located in the first horizontal direction. The movable contact 22 and the static contact 32 are located between the two arc-extinguishing permanent magnets 9. The magnetic field generated by the arc-extinguishing permanent magnet 9 is consistent with the direction of the self-magnetic field generated by the load loop where the first load lead-out terminal 4 is located. The part of the first flange portion 111 facing the two arc-extinguishing permanent magnets 9 is respectively provided with a rib 1114, which presses against the arc-extinguishing permanent magnet 9, as shown in FIG. 17 and FIG. 18. This prevents the arc-extinguishing permanent magnet 9 from shaking and forms multi-point support between the base 6 and the bobbin 11, improving stability. The first load lead-out terminal 4 is provided with two first shoulders 43 (as shown in FIG. 8), and the second load lead-out terminal 5 is provided with two second shoulders 51 (as shown in FIG. 9). The first shoulders 43 and the second shoulders 51 respectively press against the base 6 to position the base 6. The bottom surface of the base 6 is provided with multiple second bosses 63 to elevate the electromagnetic relay, as shown in FIG. 1, FIG. 14, and FIG. 29. When this disclosure needs to be soldered to a PCB, the second bosses 63 can elevate the relay to prevent direct contact between the PCB board and the base 6, which would cause heat concentration. Therefore, the second bosses 63 helps provide heat dissipation space. In addition, during potting encapsulation around the base 6, the design of the second bosses 63 can prevent excessive glue from affecting PCB soldering. The second bosses 63 can also increase the creepage distance between the coil lead-out terminal 16 and the first load lead-out terminal 4, the second load lead-out terminal 5. The number of the second bosses 63 is specifically four, arranged in two rows and two columns.

[0064] In this embodiment, the inner side surface of the housing 7 is provided with a guiding rib 71 extending along its height direction (as shown in FIG. 19). The positions of the first flange portion 111 and the second flange portion 112 corresponding to the guiding ribs 71 are respectively provided with a guiding groove 114 matching the guiding ribs 71, as shown in FIG. 10, FIG. 20, and FIG. 21. The height direction is the direction of the Z-axis direction in FIG. 2. Specifically, the two inner side surfaces of the housing 7 in the first horizontal direction are each provided with a guiding rib 71. The two guiding ribs 71 are respectively offset from the middle position of their inner side surfaces and located on the same side of the middle position. The design of the guiding ribs 71 and the guiding grooves 114 provides assembly guidance and prevents the housing 7 from being installed in reverse.

[0065] In this embodiment, as shown in FIG. 22 to FIG. 24, the part of the first flange portion 111 between the static contact 32 and the armature 15 is provided with a retaining wall 1115, which protrudes beyond the static contact 32 and can block contacts flying debris. The part of the first flange portion 111 between the static contact piece 31 and the iron core 13 is provided with a separation groove 1117 and / or a partition wall 1118, which increases the difficulty of the flying debris reaching the iron core 13 and also increases the creepage distance between the static contact 32 and the iron core 13. The iron core 13 adopts a laminated design but is not limited to this.

[0066] In this embodiment, as shown in FIG. 25 to FIG. 28, the end of the third insertion hole 1119 away from the second flange portion 112 is respectively provided with a stepped surface 11110 on the two sides facing each other in the second horizontal direction perpendicular to the first horizontal direction. The coil lead-out terminal 16 is respectively provided with a protrusion 161 at the positions corresponding to each stepped surface 11110, and the protrusion 161 rests on the stepped surface 11110. This provides a pressing force point for assembly tools and can also serve as a positioning reference. The two sides of the third insertion hole 1119 facing each other in the second horizontal direction are respectively provided with a guiding groove 11111, which is located at the inner side of the stepped surface 11110 (i.e., the side of the stepped surface 11110 closer to the second flange portion 112). The distance between the two guiding grooves 11111 gradually decreases along the insertion direction of the coil lead-out terminal 16. The guiding groove 11111 helps guide the slender coil lead-out terminal 16 during insertion and collects plastic debris generated during insertion, avoiding product failure due to poor conduction. The stepped surface 11110 is located at the inner side of the glue storage groove 1111.

[0067] In this embodiment, as shown in FIG. 29, the bobbin 11 is equipped with an insulating spacer 8 located between the coil 12 and the other side of the yoke 14, which can increase the electrical clearance between the coil 12 and the yoke 14 and increase the creepage distance. The insulating spacer 8 is roughly ]-shaped, with its two ends respectively snapped onto the first flange portion 111 and the second flange portion 112 of the bobbin 11.

[0068] The hinge-type electromagnetic relay of this disclosure has the first load lead-out terminal 4, the second load lead-out terminal 5, and the contact set located at the same side of the bobbin 11. The first load lead-out terminal 4 and the second load lead-out terminal 5 are parallel to each other, and the first load lead-out terminal 4 and the second load lead-out terminal 5 are respectively located at two opposite sides of the first flange portion 111, making the current path between the first load lead-out terminal 4 and the second load lead-out terminal 5 the shortest: current sequentially passes through the first load lead-out terminal 4, the flexible connecting wire 23, and the contact set to flow to the second load lead-out terminal 5, or current sequentially passes through the second load lead-out terminal 5, the contact set, and the flexible connecting wire 23 to flow to the first load lead-out terminal 4. This not only simplifies the structure of the first load lead-out terminal 4 and the second load lead-out terminal 5, saving costs, but also helps reduce heat generation in high-current environments, thereby lowering product temperature rise. Notably, the movable contact piece 21 is made of stainless steel, hardly carries current, and generates low heat. The movable contact part 2 mainly relies on the flexible connecting wire 23 to carry current. Therefore, the movable contact part 2 of this disclosure achieves an elasticity and current carrying separation design. As the working current increases, the movable contact piece 21 will not generate excessive heat. Thus, not affecting the magnetic conductivity of the armature 15 or the elasticity of the movable contact piece 21 itself. The flexible connecting wire 23 is soft copper wire, and the first load lead-out terminal 4 and the second load lead-out terminal 5 are made of copper or copper alloy, providing good conductivity. By selecting the wire diameter of the flexible connecting wire 23, the load capacity can be adjusted, enabling this disclosure to significantly increase current-carrying capacity while maintaining the same volume, achieving miniaturization and high current-carrying effects. The first load lead-out terminal 4, the second load lead-out terminal 5, and the two coil lead-out terminals 16 are distributed on the four edges of the first flange portion 111, ensuring sufficient electrical clearance and creepage distance between the lead-out terminals and improving the voltage resistance performance of the coil lead-out terminal.

[0069] The hinge-type electromagnetic relay of this disclosure adopts an inverted structure. During current-carrying, the magnetic field generated by the current in the second load lead-out terminal 5 and the static contact piece 31 is perpendicular to the arc direction, exerting a force F1 on the arc (as shown in FIG. 5 and FIG. 6). The magnetic field of the arc-extinguishing permanent magnet and the self-magnetic field generated by the current in the load loop can be used for magnetic blowout arc extinguishing. The larger the current, the more obvious the effect, effectively improving electrical life capability. The magnetic field direction of the arc-extinguishing permanent magnet is consistent with the self-magnetic field direction generated by the load. During operation, in the magnetic field generated by the second load lead-out terminal 5 and the static contact piece 31, the flexible connecting wire 23 will be subjected to a downward Ampere force F2 due to the current (as shown in FIG. 5 and FIG. 6), offsetting the electro-dynamic repulsion force, making the movable contact 22 press tightly against the static contact 32, reducing the impact of electro-dynamic repulsion, and increasing the ability of the relay to withstand short-circuit current shocks. FIG. 5 and FIG. 6 show two states with reversed current directions.

[0070] In other embodiments, as shown in FIG. 30, the second load lead-out terminal 5 is L-shaped, including a first portion 51 and a second portion 52 that form an angle between them. The first portion 51 is parallel to the first load lead-out terminal 4. By adjusting the shape of the second load lead-out terminal 5, it can adapt to installation requirements of different applications while maintaining compact internal structure layout and high space utilization. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 1 and FIG. 2, and will not be repeated here.

[0071] In other embodiments, as shown in FIG. 31 to FIG. 33, the first load lead-out terminal 4 and the second load lead-out terminal 5 are parallel to each other along the second horizontal direction. Further, the first load lead-out terminal 4 corresponds to the first flange portion 111 of the bobbin 11, and the second load lead-out terminal 5 corresponds to the second flange portion 112 of the bobbin 11. The armature 15 is L-shaped and includes a first portion 150 and a second portion 151 that form an angle between them. The connection position between the first portion 150 and the second portion 151 fits with the blade edge of the yoke 14. The first portion 150 is located at the outer side of the first flange portion 111, and the end of the second portion 151 movably cooperates with the movable contact piece 21. When the first portion 150 of the armature 15 is attracted by the iron core 13, the second portion 151 moves toward the movable contact piece 21 and pushes the movable contact piece 21. The end of the movable contact piece 21 away from the movable contact 22 is bent and extended to form a fixed portion 210, which is fixed to the first load lead-out terminal 4. The flexible connecting wire 23 is located on the movable contact piece 21, with one end electrically connected to the movable contact 22 and the other end electrically connected to the first load lead-out terminal 4. In certain applications, this embodiment can simplify the structure to meet layout requirements. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 1 and FIG. 2 and will not be repeated here.

[0072] In other embodiments, as shown in FIG. 34 and FIG. 35, the movable contact piece 21 does not have the fixed portion 210 but is fixedly connected to the armature 15 by riveting or other fixing methods. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 31 and will not be repeated here.

[0073] This disclosure also provides an electromagnetic relay with low heat generation.

[0074] According to one aspect of this disclosure, an electromagnetic relay includes a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal. The movable contact part includes a movable contact piece and a movable contact disposed on the movable contact piece. The magnetic circuit part includes an armature. The magnetic circuit part drives the movable contact piece together with the movable contact through the armature. wherein the electromagnetic relay further includes a flexible conductor. The second load lead-out terminal is electrically connected to or integrally formed with the static contact part. One end of the flexible conductor is electrically connected to the movable contact, and another end is electrically connected to the second load lead-out terminal. The first load lead-out terminal, the flexible conductor, and the second load lead-out terminal are located at a same side of the magnetic circuit part. The first load lead-out terminal, the movable contact piece, and the second load lead-out terminal form a U-shaped structure.

[0075] According to one embodiment of this disclosure, the magnetic circuit part includes a yoke, an iron core fixed to the yoke, a coil wound around the iron core, and an armature rotatably fitted at a blade edge of the yoke.

[0076] According to one embodiment of this disclosure, the magnetic circuit part includes a bobbin, a yoke, an iron core, a coil, and an armature. The bobbin includes a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion. The yoke is fixed to the bobbin. The iron core is disposed on the bobbin and fixedly connected to the yoke. The coil is wound around the winding portion. The armature is rotatably fitted at the blade edge of the yoke.

[0077] According to one embodiment of this disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, the fixed portion is fixed to the yoke. The armature is plate-shaped, with one end rotatably connected to the blade edge of the yoke and another end extending toward the iron core. The movable contact piece is fixedly connected to the armature.

[0078] According to one embodiment of this disclosure, an end of the movable contact piece away from the movable contact has a fixed portion, the fixed portion is fixed to the first load lead-out terminal. The armature is L-shaped and includes a first armature portion and a second armature portion connected to each other. The armature is rotatably connected to the blade edge of the yoke at a connection position of the first armature portion and the second armature portion. The first armature portion extends toward the iron core, and the end of the second armature portion is a cooperating portion that works with the movable contact piece.

[0079] According to one embodiment of this disclosure, the end of the movable contact piece is provided with two conductive pieces. The movable contact is divided into two groups, respectively fixed on two conductive pieces. Each of the conductive piece has a welding portion.

[0080] According to one embodiment of this disclosure, the two welding portions of the two conductive pieces are respectively located at two sides of the movable contact piece away from each other. a number of the flexible conductor is two, respectively disposed at sides of the movable contact piece away from each other. One end of each of the two flexible conductors is electrically connected to corresponding welding portion.

[0081] According to one embodiment of this disclosure, the flexible conductor is a flexible connecting wire; or, the flexible conductor includes one or multiple stacked conductive reeds. The material of the conductive reed is the same as or different from the material of the movable contact piece.

[0082] According to one embodiment of this disclosure, the flexible conductor includes one or multiple stacked conductive reeds. The part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction. Each branch piece is provided with at least one movable contact. The conductive reed is forked to form multiple conductive branch pieces, which correspond one-to-one with the multiple branch pieces.

[0083] According to one embodiment of this disclosure, the flexible conductor is located inside the U-shaped structure.

[0084] According to one embodiment of this disclosure, the electromagnetic relay further includes a housing and a base. A bottom end of the housing is provided with an opening. The base is connected to the housing at the opening. The magnetic circuit part, the movable contact part, and the static contact part are all accommodated in a space enclosed by the base and the housing. The first load lead-out terminal and the second load lead-out terminal respectively pass through the base and extend outward to form a current-carrying loop with an external load.

[0085] Compared with the prior art, the electromagnetic relay of this disclosure has the following beneficial effects: The first load lead-out terminal and the second load lead-out terminal are electrically connected through the flexible conductor, and the first load lead-out terminal, the flexible conductor, and the second load lead-out terminal are located at the same side of the magnetic circuit part, making the current-carrying path between the first load lead-out terminal and the second load lead-out terminal short. This not only simplifies the structure of the first load lead-out terminal and the second load lead-out terminal and reduces costs but also helps reduce heat generation in the current-carrying path, suppresses product temperature rise, and is conducive to reducing heat generation in high-current environments, thereby enabling application to PCBA with a Tg value greater than 125°C. At the same time, the first load lead-out terminal, the movable contact piece, and the second load lead-out terminal form a U-shaped structure, which is conducive to compact structural layout and reduced volume.

[0086] Hereinafter, specific implementations of the electromagnetic relay of this disclosure will be described with reference to the accompanying drawings.

[0087] As shown in FIG. 36, FIG. 37, and FIG. 38, the first embodiment of the electromagnetic relay of this disclosure includes a housing 7, a base 6, a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal 4, a second load lead-out terminal 5, and a flexible conductor.

[0088] As shown in FIG. 37, the bottom end of the housing 7 is provided with an opening. The base 6 is connected to the housing 7 at the opening. The magnetic circuit part, the movable contact part, and the static contact part are all accommodated in the space enclosed by the base 6 and the housing 7.

[0089] Referring to FIG. 37 and FIG. 38, the magnetic circuit part includes a coil 12, an iron core 13, a yoke 14, and an armature 15.

[0090] In this first embodiment, the yoke 14 is L-shaped and includes a horizontal first yoke portion 141 and a vertical second yoke portion 142. The iron core 13 is vertically disposed, with its upper end fixed to the first yoke portion 141. The coil 12 is wound around the iron core 13. The armature 15 is plate-shaped, with one end rotatably fitted at the blade edge of the yoke 14 and the other end extending toward the iron core 13 and located below the iron core 13.

[0091] The structure of the magnetic circuit part in this disclosure can vary and is not limited to the specific description above. For example, in some other embodiments, the structure of the magnetic circuit part may be the same as that of the hinge-type electromagnetic relay shown in FIG. 1, i.e., including a bobbin 11, a yoke 14, an iron core 13, a coil 12, and an armature 15. The bobbin 11 includes a first flange portion 111, a second flange portion 112, and a winding portion 113 disposed between the first flange portion 111 and the second flange portion 112. The iron core 13 is disposed on the bobbin 11. The yoke 14 is fixedly connected to one end of the iron core 13. The coil 12 is wound around the winding portion. The armature 15 is rotatably fitted at the blade edge of the yoke 14. An insulating spacer 8 is provided on the side of the yoke 14 facing the coil 12.

[0092] The static contact part includes a static contact piece 31 and a static contact 32 fixed on the static contact piece 31. In this first embodiment, the second load lead-out terminal 5 is integrally formed with the static contact piece 31. The static contact piece 31 is located inside the housing 7, and the second load lead-out terminal 5 passes through the base 6 and extends outward. In some other embodiments, the second load lead-out terminal 5 and the static contact piece 31 may also be two independent components electrically connected by welding or other fixing methods.

[0093] The movable contact part includes a movable contact piece 21, a movable contact 22, and a fixed portion 210. The movable contact 22 is fixed to one end of the movable contact piece 21. The fixed portion 210 is bent and extended from the end of the movable contact piece 21 away from the movable contact 22, and the end of the fixed portion 210 is fixed to the yoke 14. The armature 15 is fixedly connected to the movable contact piece 21. The static contact piece 31 is located above the movable contact 22, and the static contact 32 is disposed on the lower surface of the static contact piece 31. The movable contact 22 is disposed on the upper surface of the movable contact piece 21. The static contact 32 and the movable contact 22 cooperate to form a contact set.

[0094] As shown in FIG. 38, in this first embodiment, the flexible conductor is the flexible connecting wire 23, and the number of the flexible connecting wire 23 may be the same as the number of the movable contact. One end of the flexible connecting wire 23 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. In this first embodiment, the armature 15 is located at the side of the movable contact piece 21 where the movable contact 22 is disposed, and the flexible connecting wire 23 is located at the side of the movable contact piece 21 away from the movable contact 22, i.e., the flexible connecting wire 23 and the armature 15 are respectively disposed at the two sides of the movable contact piece 21.

[0095] As shown in FIG. 37 and FIG. 38, in this first embodiment, the first load lead-out terminal 4, the movable contact piece 21, and the second load lead-out terminal 5 form a U-shaped structure, and the flexible connecting wire 23 is located inside the U-shaped structure, making the structure of this disclosure compact.

[0096] Referring to FIG. 37, FIG. 39, and FIG. 40, in this first embodiment, the rotation of the armature 15 can drive the movable contact piece 21 together with the movable contact 22. Specifically, when current flows through the coil 12, the end of the armature 15 below the iron core 13 is attracted by the iron core 13 and moves upward. The movable contact piece 21 is fixedly connected to the armature 15, so the movable contact piece 21 moves upward with the armature 15, thereby driving the movable contact 22 at the end of the movable contact piece 21 to move upward and electrically contact the static contact 32, conducting the current-carrying loop. Conversely, when no current flows through the coil 12, the movable contact piece 21 moves downward, driving the movable contact 22 to separate from the static contact 32, thereby breaking the current-carrying loop.

[0097] In this first embodiment, as shown in FIG. 40, the first load lead-out terminal 4 and the second load lead-out terminal 5 are electrically connected to an external load. The current sequentially flows through the second load lead-out terminal 5, the static contact 32, the movable contact 22, the flexible connecting wire 23, to the first load lead-out terminal 4, the external load, and then back to the second load lead-out terminal 5, forming a current-carrying loop. Since the first load lead-out terminal 4, the flexible connecting wire 23, and the second load lead-out terminal 5 are located at the same side of the magnetic circuit part, the current-carrying path is short, which helps reduce heat generation in the current-carrying path, suppresses product temperature rise, and is conducive to reducing heat generation in high-current environments.

[0098] As shown in FIG. 41 to FIG. 43, in the second embodiment of the electromagnetic relay of this disclosure, the flexible conductor is one or multiple stacked conductive reeds 24. The conductive reed 24 is located at the side of the movable contact piece 21 away from the movable contact 22. One end of the conductive reed 24 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. The material of the conductive reed 24 may be the same as or different from that of the movable contact piece 21. The multiple stacked conductive reeds 24 improve flexibility and simplify the structure.

[0099] Further, the part of the movable contact piece 21 where the movable contact 22 is disposed is forked to form multiple branch pieces 212 apart from each other along the first horizontal direction. Each branch piece 212 is provided with at least one movable contact 22. The conductive reed 24 is forked to form multiple conductive branch pieces 241, which correspond one-to-one with the multiple branch pieces 212. The forked design of the conductive reed 24 can reduce mutual interference between the multiple conductive branch pieces 241, prevent interference, improve flexibility, and make the contact state between the movable contact 22 and the static contact 32 better.

[0100] The current path between the first load lead-out terminal 4 and the second load lead-out terminal 5 is as follows: the current sequentially flows through the first load lead-out terminal 4, the conductive reed 24, the movable contact 22, the static contact 32, to the second load lead-out terminal 5, the external load, and then back to the first load lead-out terminal 4, forming a current loop. Alternatively, the current sequentially flows through the second load lead-out terminal 5, the static contact 32, the movable contact 22, the conductive reed 24, to the first load lead-out terminal 4, the external load, and then back to the second load lead-out terminal 5, forming a current loop. This not only simplifies the structure of the first load lead-out terminal 4 and the second load lead-out terminal 5, saving costs, but also helps reduce heat generation in high-current environments, thereby lowering product temperature rise.

[0101] The other structures and working principles of the second embodiment of the electromagnetic relay are basically the same as those of the first embodiment of the electromagnetic relay shown in FIG. 36 and will not be repeated here.

[0102] In addition, in the second embodiment of the electromagnetic relay, the conductive reed 24 used as the flexible conductor can also replace the flexible connecting wire 23 in the hinge-type electromagnetic relay shown in FIG. 2. As shown in FIG. 44, in the third embodiment of the electromagnetic relay of this disclosure, the flexible conductor is one or multiple stacked conductive reeds 24. The shape and structure of the conductive reed 24 are the same as those of the movable contact piece 21, so the multiple conductive reeds 24 and the movable contact piece 21 can be stacked. One end of the conductive reed 24 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. The conductive reed 24 and the movable contact piece 21 are both fixed to the armature 15. The other structures and working principles of the hinge-type electromagnetic relay in this embodiment are basically the same as those in the embodiment shown in FIG. 41 and will not be repeated here. The other structures and working principles of the third embodiment of the electromagnetic relay are basically the same as those of the second embodiment of the electromagnetic relay shown in FIG. 41 and will not be repeated here.

[0103] In addition, in the third embodiment of the electromagnetic relay, the conductive reed 24 used as the flexible conductor can also replace the flexible connecting wire 23 in the hinge-type electromagnetic relay shown in FIG. 2.

[0104] Referring to FIG. 45 and FIG. 46, in the third embodiment of the electromagnetic relay of this disclosure, the movable contact piece 21 is fixed to the first load lead-out terminal 4 through the fixed portion 210. The movable contact 22 is disposed on the lower surface of the movable contact piece 21. The static contact piece 31 is located below the movable contact 22, and the static contact 32 is disposed on the upper surface of the static contact piece 31. The static contact 32 and the movable contact 22 cooperate to form a contact set.

[0105] The armature 15 is L-shaped and includes a first armature portion 151 and a second armature portion 152 connected to each other and form an obtuse angle. The armature 15 is rotatably connected to the blade edge of the yoke 14 at the connection position of the first armature portion 151 and the second armature portion 152. The first armature portion 151 extends toward the iron core 13, and the end of the second armature portion 152 is a cooperating portion that works with the movable contact piece 21. When the armature 15 rotates around the blade edge of the yoke 14, the end of the second armature portion 152 can press downward on the movable contact piece 21, making the movable contact 22 electrically contact the static contact 32. When the armature 15 rotates in the reverse direction, the end of the second armature portion 152 stops pressing the movable contact piece 21, making the movable contact 22 separate from the static contact 32 and breaking the current-carrying loop.

[0106] The other structures and working principles of the third embodiment of the electromagnetic relay are basically the same as those of the first embodiment of the electromagnetic relay shown in FIG. 36 and will not be repeated here.

[0107] Referring to FIG. 47, in the fourth embodiment of the electromagnetic relay of this disclosure, the end of the movable contact piece 21 is provided with two conductive pieces 27. The movable contact 22 is divided into two groups, with each group including at least two movable contacts 22. The two groups of movable contacts 22 are respectively fixed on the two conductive pieces 27. As shown in FIG. 47, each conductive piece 27 is provided with two movable contacts 22.

[0108] The conductive piece 27 has a welding portion 271. In this fourth embodiment, the two conductive pieces 27 respectively extend to the opposite sides of the movable contact piece 21. The part of the conductive piece 27 extending out of the movable contact piece 21 is the welding portion 271, i.e., the two welding portions 271 of the two conductive pieces 27 are respectively located at the opposite sides of the movable contact piece 21. The welding portion 271 provides a welding position for the flexible connecting wire 23 to facilitate the electrical connection between the flexible connecting wire 23 and the movable contact. The number of the flexible connecting wire 23 is two, respectively disposed at the opposite sides of the movable contact piece 21. One end of the flexible connecting wire 23 is electrically connected to the welding portion 271, and the other end is electrically connected to the first load lead-out terminal 4.

[0109] The conductive piece 27 with the welding portion 271 is not limited to the above fourth embodiment and is also applicable to other embodiments. For example, in the embodiment shown in FIG. 38, the end of the movable contact piece 21 is provided with two conductive pieces 27. The movable contact 22 is divided into two groups, with each group including two movable contacts 22. The two groups of movable contacts 22 are respectively disposed on the two conductive pieces 27, i.e., each conductive piece 27 is provided with two movable contacts 22. The welding portion 271 of the conductive piece 27 may be located between the two movable contacts 22 or at the end close to the other conductive piece 27. In this way, only two flexible connecting wires 23 are needed. One end of each of the two flexible connecting wires 23 is electrically connected to one welding portion 271, and the other end is electrically connected to the second load lead-out terminal 5. Since the number of the flexible connecting wire 23 is less, the occupied space is small, and the arrangement is convenient, the limit hook 211 may not be needed.

[0110] The other structures and working principles of the fourth embodiment of the electromagnetic relay are basically the same as those of the third embodiment of the electromagnetic relay shown in FIG. 45 and will not be repeated here.

[0111] The above are only preferred implementations of the disclosed embodiments and are not intended to limit the disclosed embodiments. For those skilled in the art, the disclosed embodiments may have various modifications and changes. Any modifications, equivalent replacements, or improvements made within the spirit and principles of the disclosed claims shall be included within the protection scope of the disclosed claims.

Examples

first embodiment

[0087]As shown in FIG. 36, FIG. 37, and FIG. 38, the electromagnetic relay of this disclosure includes a housing 7, a base 6, a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal 4, a second load lead-out terminal 5, and a flexible conductor.

[0088]As shown in FIG. 37, the bottom end of the housing 7 is provided with an opening. The base 6 is connected to the housing 7 at the opening. The magnetic circuit part, the movable contact part, and the static contact part are all accommodated in the space enclosed by the base 6 and the housing 7.

[0089]Referring to FIG. 37 and FIG. 38, the magnetic circuit part includes a coil 12, an iron core 13, a yoke 14, and an armature 15.

[0090]In this first embodiment, the yoke 14 is L-shaped and includes a horizontal first yoke portion 141 and a vertical second yoke portion 142. The iron core 13 is vertically disposed, with its upper end fixed to the first yoke portion 141. The coil 12 is wound around t...

second embodiment

[0098]As shown in FIG. 41 to FIG. 43, in the electromagnetic relay of this disclosure, the flexible conductor is one or multiple stacked conductive reeds 24. The conductive reed 24 is located at the side of the movable contact piece 21 away from the movable contact 22. One end of the conductive reed 24 is electrically connected to the movable contact 22, and the other end is electrically connected to the first load lead-out terminal 4. The material of the conductive reed 24 may be the same as or different from that of the movable contact piece 21. The multiple stacked conductive reeds 24 improve flexibility and simplify the structure.

[0099]Further, the part of the movable contact piece 21 where the movable contact 22 is disposed is forked to form multiple branch pieces 212 apart from each other along the first horizontal direction. Each branch piece 212 is provided with at least one movable contact 22. The conductive reed 24 is forked to form multiple conductive branch pieces 241, w...

third embodiment

[0103]In addition, in the electromagnetic relay, the conductive reed 24 used as the flexible conductor can also replace the flexible connecting wire 23 in the hinge-type electromagnetic relay shown in FIG. 2.

[0104]Referring to FIG. 45 and FIG. 46, in the third embodiment of the electromagnetic relay of this disclosure, the movable contact piece 21 is fixed to the first load lead-out terminal 4 through the fixed portion 210. The movable contact 22 is disposed on the lower surface of the movable contact piece 21. The static contact piece 31 is located below the movable contact 22, and the static contact 32 is disposed on the upper surface of the static contact piece 31. The static contact 32 and the movable contact 22 cooperate to form a contact set.

[0105]The armature 15 is L-shaped and includes a first armature portion 151 and a second armature portion 152 connected to each other and form an obtuse angle. The armature 15 is rotatably connected to the blade edge of the yoke 14 at the ...

Claims

1. A hinge-type electromagnetic relay, comprising a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal; the magnetic circuit part comprising a bobbin, a coil, an iron core, a yoke, and an armature; the bobbin comprising a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion; the movable contact part comprising a movable contact piece and a movable contact disposed on the movable contact piece; the bobbin, the iron core, the yoke, and the movable contact piece-armature assembly are assembled together in a hinge-type structure; the static contact part comprising a static contact piece and a static contact disposed on the static contact piece; the movable contact and the static contact cooperate to form a contact set; the first load lead-out terminal is electrically connected to the movable contact part; the second load lead-out terminal is electrically connected to or integrally formed with the static contact piece; wherein the first load lead-out terminal, the second load lead-out terminal, and the contact set are located at a same side of the bobbin, and a current-carrying paths flowing through the first load lead-out terminal and the second load lead-out terminal are located at the same side of the bobbin.

2. The hinge-type electromagnetic relay according to claim 1, wherein the first load lead-out terminal and the second load lead-out terminal are parallel to each other along a first horizontal direction.

3. The hinge-type electromagnetic relay according to claim 1, wherein the movable contact piece is fixedly connected to the armature to form the movable contact piece-armature assembly; the static contact piece is mounted on the first flange portion; the first load lead-out terminal and the second load lead-out terminal are respectively located at two opposite sides of the first flange portion.

4. The hinge-type electromagnetic relay according to claim 1, wherein the first flange portion is inserted with two coil lead-out terminals, and the two coil lead-out terminals are respectively located at another two opposite sides of the first flange portion.

5. The hinge-type electromagnetic relay according to claim 2, wherein the movable contact part further comprises a flexible connecting wire, and the flexible connecting wire is located at a side of the movable contact piece away from the movable contact; one end of the flexible connecting wire is electrically connected to the movable contact, and another end is electrically connected to the first load lead-out terminal.

6. The hinge-type electromagnetic relay according to claim 5, wherein the number of the movable contact is multiple, and the multiple movable contacts are arranged along the first horizontal direction; the number of the static contact and the flexible connecting wire are respectively same as the number of the movable contact; each movable contact is electrically connected to the first load lead-out terminal through one flexible connecting wire.

7. The hinge-type electromagnetic relay according to claim 6, wherein among the multiple flexible connecting wires, two outermost flexible connecting wires respectively abut against a limit hook disposed at two opposite ends of the movable contact piece along the first horizontal direction.

8. The hinge-type electromagnetic relay according to claim 7, wherein a part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction; each branch piece is provided with at least one movable contact, and a portion of each branch piece where the movable contact is located is widened; adjacent branch pieces are transitioned with a rounded chamfer at roots; a distance between parts of the movable contact pieces where the limit hooks are disposed are smaller than a distance between outer sides of two outermost branch pieces.

9. The hinge-type electromagnetic relay according to any one of claims 1-8, wherein the first load lead-out terminal is provided with a welding piece extending toward the movable contact, and another end of the flexible connecting wire is welded to the welding piece; the first load lead-out terminal is in contact connection with the yoke.

10. The hinge-type electromagnetic relay according to claim 4, further comprises a base and a housing; a bottom end of the housing is provided with an opening, and the housing is connected with the base at the opening to enclose the magnetic circuit part, the movable contact part, and the static contact part; the first load lead-out terminal and the second load lead-out terminal respectively pass through first insertion holes provided on the base; the two coil lead-out terminals respectively pass through second insertion holes provided on the base; the first flange portion is provided with a third insertion hole for the coil lead-out terminal to pass through; an end of the third insertion hole away from the second flange portion is provided with a glue storage groove surrounding the coil lead-out terminal; during potting encapsulation, glue enters from a gap between the coil lead-out terminal and the second insertion hole and fills the glue storage groove.

11. The hinge-type electromagnetic relay according to claim 10, wherein inner side surfaces around the glue storage groove are inclined surfaces with roots closer to the coil lead-out terminal; the inner side surface of the second insertion hole corresponding to the glue storage groove is provided with a glue infiltration groove to allow the glue to flow into the glue storage groove along the glue infiltration groove.

12. The hinge-type electromagnetic relay according to claim 10, wherein an end of the third insertion hole away from the second flange portion is respectively provided with a stepped surface on two sides facing each other in a second horizontal direction perpendicular to the first horizontal direction; the coil lead-out terminal is respectively provided with a protrusion at a position corresponding to each stepped surface, and the protrusion rests on the stepped surface; the two sides of the third insertion hole facing each other in the second horizontal direction are respectively provided with a guiding groove; a distance between two guiding grooves gradually decreases along an insertion direction of the coil lead-out terminal; the guiding groove is located at an inner side of the stepped surface, and the stepped surface is located at an inner side of the glue storage groove.

13. The hinge-type electromagnetic relay according to claim 10, wherein an inner side surface of the housing is provided with guiding ribs extending along a height direction of the housing; positions of the first flange portion and the second flange portion corresponding to the guiding ribs are respectively provided with a guiding groove matching the guiding ribs; the bobbin is equipped with an insulating spacer located between the coil and the yoke; the movable contact piece is L-shaped; one side of the movable contact piece is fixedly connected to the armature and provided with the movable contact; another side of the movable contact piece is fixedly connected to the yoke.

14. The hinge-type electromagnetic relay according to any one of claims 1-8, wherein two ends of the static contact piece along the first horizontal direction are respectively laterally inserted into two insertion slots correspondingly provided on the first flange portion, and the two ends of the static contact piece along the first horizontal direction respectively extend outward with a protrusion along a second horizontal direction perpendicular to the first horizontal direction; a part of the static contact piece not inserted into the first flange portion has a gap with the first flange portion in a height direction; an end surfaces of the first flange portion at the positions where two insertion slots are located are respectively provided with a first boss.

15. The hinge-type electromagnetic relay according to any one of claims 1-8, wherein a part of the first flange portion between the static contact and the armature is provided with a retaining wall, and the retaining wall protrudes beyond the static contact; a part of the first flange portion between the static contact piece and the iron core is provided with a separation groove and / or a partition wall; and / or, an outer surface of the base is provided with multiple second bosses for elevating the electromagnetic relay.

16. The hinge-type electromagnetic relay according to claim 1, wherein the first load lead-out terminal and the second load lead-out terminal are parallel to each other along a second horizontal direction.

17. The hinge-type electromagnetic relay according to claim 16, wherein the first load lead-out terminal corresponds to the first flange portion, and the second load lead-out terminal corresponds to the second flange portion.

18. The hinge-type electromagnetic relay according to claim 1, wherein the second load lead-out terminal is L-shaped and comprises a first portion and a second portion, and the first portion is parallel to the first load lead-out terminal.

19. An electromagnetic relay, comprising a magnetic circuit part, a movable contact part, a static contact part, a first load lead-out terminal, and a second load lead-out terminal; the movable contact part comprises a movable contact piece and a movable contact disposed on the movable contact piece; the magnetic circuit part comprises an armature; the magnetic circuit part drives the movable contact piece together with the movable contact through the armature; the electromagnetic relay further comprises a flexible conductor; the second load lead-out terminal is electrically connected to or integrally formed with the static contact part; one end of the flexible conductor is electrically connected to the movable contact, and another end is electrically connected to the second load lead-out terminal; the first load lead-out terminal, the flexible conductor, and the second load lead-out terminal are located at a same side of the magnetic circuit part; the first load lead-out terminal, the movable contact piece, and the second load lead-out terminal form a U-shaped structure.

20. The electromagnetic relay according to claim 19, wherein the magnetic circuit part comprises a yoke, an iron core fixed to the yoke, a coil wound around the iron core, and an armature rotatably fitted at a blade edge of the yoke.

21. The electromagnetic relay according to claim 19, wherein the magnetic circuit part comprises a bobbin, a yoke, an iron core, a coil, and an armature; the bobbin comprises a first flange portion, a second flange portion, and a winding portion disposed between the first flange portion and the second flange portion; the yoke is fixed to the bobbin; the iron core is disposed on the bobbin and fixedly connected to the yoke; the coil is wound around the winding portion; the armature is rotatably fitted at a blade edge of the yoke.

22. The electromagnetic relay according to claim 20 or 21, wherein an end of the movable contact piece away from the movable contact has a fixed portion, and the fixed portion is fixed to the yoke; the armature is plate-shaped, with one end rotatably connected to the blade edge of the yoke and another end extending toward the iron core; the movable contact piece is fixedly connected to the armature.

23. The electromagnetic relay according to claim 20 or 21, wherein an end of the movable contact piece away from the movable contact has a fixed portion, and the fixed portion is fixed to the first load lead-out terminal; the armature is L-shaped and comprises a first armature portion and a second armature portion connected to each other; the armature is rotatably connected at a connection position of the first armature portion and the second armature portion to the blade edge of the yoke; the first armature portion extends toward the iron core, and an end of the second armature portion is a cooperating portion that works with the movable contact piece.

24. The electromagnetic relay according to claim 19, 20, or 21, wherein an end of the movable contact piece is provided with two conductive pieces; the movable contact is divided into two groups, respectively fixed on two conductive pieces; the conductive piece has a welding portion.

25. The electromagnetic relay according to claim 24, wherein two welding portions of the two conductive pieces are respectively located at sides of the movable contact piece away from each other; the number of the flexible conductor is two, respectively disposed at sides of the movable contact piece away from each other; one end of each of the two flexible conductors is electrically connected to corresponding welding portion.

26. The electromagnetic relay according to claim 19, wherein the flexible conductor is a flexible connecting wire; or, the flexible conductor comprises one or multiple stacked conductive reeds, and material of the conductive reed is same as or different from material of the movable contact piece.

27. The electromagnetic relay according to claim 26, wherein the flexible conductor comprises one or multiple stacked conductive reeds; a part of the movable contact piece where the movable contact is disposed is forked to form multiple branch pieces apart from each other along the first horizontal direction; each branch piece is provided with at least one movable contact; the conductive reed is forked to form multiple conductive branch pieces, multiple conductive branch pieces are in one-to-one correspondence with the multiple branch pieces.

28. The electromagnetic relay according to any one of claims 19-21 and 24-27, wherein the flexible conductor is located inside the U-shaped structure.

29. The electromagnetic relay according to any one of claims 19-21 and 24-27, further comprises a housing and a base; a bottom end of the housing is provided with an opening; the base is connected to the opening of the housing; the magnetic circuit part, the movable contact part, and the static contact part are all accommodated in a space enclosed by the base and the housing; the first load lead-out terminal and the second load lead-out terminal respectively pass through the base and extend outward to form a current-carrying loop with an external load.

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